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Ratio FreeDiver Black Dial Sapphire Crystal Stainless Steel Automatic RTA100 200M Men's Watch

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Ratio FreeDiver Black Dial Sapphire Crystal Stainless Steel Automatic RTA100 200M Men's Watch

Model:   RTA100

US $360.00 US $140.00 Save: US $220.00 (61% off)

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RATIO RTA100 Details

Ratio FreeDiver Black Dial Sapphire Crystal Stainless Steel Automatic RTA100 200M Men's Watch

The Ratio FreeDiver Black Dial Stainless Steel Automatic RTA100 200M is a divers’ watch is every bit the SKX save its movements (no an enhanced version) and the glass, which is a domed sapphire crystal; many more times harder and scratch resistant than the mineral crystal of the SKX. It has the same depth rating as the SKX an equally efficient, if not better.


Seiko 22mm Black Rubber Strap Included With Watch For Free



Stainless Steel Case
Stainless Steel Bracelet
Automatic Movement
Caliber: Seiko NH36A
Power Reserve Up To 40 Hours
Domed Sapphire Crystal
Black Dial
Analog Display
Luminous Hands And Markers
Unidirectional Rotating Black Bezel With 120 Clicks
Bezel With Ceramic Inlay
Day And Date Display
Screw Down Crown
Engraved Case Back
Deployment Clasp
200m Water Resistance

Approximate Case Diameter With Crown: 46mm
Approximate Case Diameter Without Crown: 41mm
Approximate Case Thickness: 15mm
Approximate Lug Width: 22mm


Brand Ratio
Series Free Diver
Model RTA100
Gender Men's
Movement Automatic
Engine Caliber: Seiko NH36A
Power Reserve Upto 40 Hours


Case Thickness 15.00 mm
Case Material Stainless Steel
Crown Screw Down Crown
Case Shape Round
Case Back Engraved Case Back
Bezel Unidirectional Bezel


Dial Type Analog
Dial Color Black
Crystal The Domed Sapphire
Hands Luminous Hands
Dial Markers Dotted Markers
Luminiscence Hands And Markers


Water Resistance 200M
Calendar Day and Date Display
Functions Day, Date, Hour, Minute, Second
Features Analog Display, Version With The Domed Sapphire, 200m Water Resistance


Band Type Bracelet
Band Material Stainless Steel
Clasp Deployment Clasp


Style Diver's
Warranty 2 Years International Warranty
Upc Code 670724764573
Ean Code 0670724764573
Internal Id RTA100
Product Category Watches
Ships in 24 hours (Except for Weekends & Holidays). FREE FEDEX Shipping for USA orders (Delivery in 2-4 days)

Packaging: Shipped in RATIO box with all the product documents(depending on shipping method chosen at checkout).

Box is secured in an additional super-strong non-collapsing cardboard box.

Warranty: 2 Years International Warranty. Refer to Warranty section for more information.

Guaranteed 100% genuine and brand new.

Read customer testimonials from your country here

Customer Reviews

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Overall Rating

(2 reviews)
Jon Wall
Verified Buyer

May 23, 2023

Arrived on time. The watch is fantastic. It does have a good heftfeel to it. Wears wella bit higher. Not a problem even with the NATO style strap thank added on. This also does reduce the weightI believe this is why it wears much better. The lume lastednight long for meI had no problem reading the dial. This watch looks even better in person. The photos are good but holding this watch in your hand is 10x better. NO COMPLAINTS about this watch. It performs very well right out of the boxkeeps very good time. I believe it was 5-10 seconds fast after one week.

Verified Buyer

January 13, 2023

top quality watch for the delivery to France montre de tres belle qualité pour le prix...reçu rapidement en France

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Product Description

RTA100: Readied for the rough. Reminds of a legend.

Defining points for the Ratio FreeDiver Black Dial Sapphire Crystal Stainless Steel Automatic RTA100 200M Men's Watch

  • Impressive, zero-distortion domed sapphire with a slightly bluish tinge. It is stronger than flat crystals of the same thickness and disperses impacts more efficiently. It is less likely to shatter and/or crack than a flat crystal. It is also more scratch-proof than other types of crystals

  • 4’o clock crown minimizing chances of wrist bites and easier operability both on and off wrist. This position makes the crown less likely to catch onto obstacles when diving and is a more ergonomic choice while engaged in vigorous activities. Besides, it helps in reducing the overall width of the watch and needless saying, this off-beat position of the crown also increases its aesthetic appeal.

6 reasons why you should go for the Ratio FreeDiver Black Dial Sapphire Crystal Stainless Steel Automatic RTA100 200M Men's Watch

  • This watch is readied for hard-hitting jobs. A solidly-built, aesthetically-pleasing watch, the Ratio FreeDiver Black Dial Sapphire Crystal Stainless Steel Automatic RTA100 200M Men's Watch is an all-round instrument for marine enthusiasts and desk-divers alike. It’s the first Freediver series to use the domed sapphire crystal, its beauty a bluish tinge that made it an instant hit among young and matured adults alike.

  • This is an excellent, everyday tool watch both for urban surroundings and outdoors. Whatever your job might be - unless there’s a formal dress code – you can wear the RTA100 anytime you like. It’s always ready for the rough!

  • The RTA100 200M Men's Watch is built all in thick-gauge surgical steel. It adds both strength and heft to the watch, only that it’s not so much of a heft. It just exerts an assuring pressure on the wrist, that’s all about it. Its construction (case, screw-down crown, engraved case-back w/image of a free diver and the deployment clasp) helps to increase the momentum of your hand rather than tying you down with its weight. The sapphire crystal, too, offers high resistance against damaging water pressure (equivalent to pressure exerted by a 200m high water column on the watch’s surface area) and its curved shape is a big aid in minimising water pressure right above the watch. The whole construction efficiently handles physical impacts (including violent tugs) and magnetic fields from everyday electronic and electrical equipment.

The crystal, the case and the Freediver-etched case back together protect the Japanese mechanical movement (with its own shock/antimagnetic features) together against violent knocks, bumps and drops.

  • A large sized dial made of brass and painted using silkscreen technique; a day/date window and prominent hands and hour markers offer maximum visibility under murky environments and when under pressing situations. This is so much like the SKX. You do not have to squint to focus on the dial to read the time, day/date or the bezel/timer reading. A big advantage is the Japan lume-filled prominent hour markers (especially at 12, 6 and 9); they are big, bright and with an almost infinite longevity. It also ensures longer hours of illumination.

  • The serrated bezel and the grooved crown facilitate a firm grip with wet fingers, with or without gloves on. It is advised not to operate the crowns under wet/immersed conditions.

  • The hour and minute hands of the RTA100 are unique in their shapes. The hour and minute hands are a mix between arrow, syringe and sword shapes while the seconds-hand is an improvisation on the sword-style with a lume-filled circle at the tail-end. All the hands are sumptuously filled with Japan-made lume the hour markers alike. The lume dot on the bezel ensures you do not miss out on the correct time-reading.

Ratio FreeDiver Black Dial Sapphire Crystal Stainless Steel Automatic RTA100 200M Men's Watch: A sum up of all the goodness

The Ratio FreeDiver Sapphire Crystal RTA100 200M Men's Watch is a great tool watch that anyone who takes water sports seriously should give a try. Its specs match that of any pro-grade diver watch but the cost doesn’t. The Ratio FreeDiver Black Dial Sapphire Crystal Stainless Steel Automatic RTA100 200M Men's Watch wears a tag that’s unbelievably lower than the rest in its league. You’ll be hard-pressed to find another watch from another brand that offers the same at the cost.

Prime points

  • Generous use of solid, surgical-grade stainless steel and lume material.

  • Visually appealing, black watch face with uniquely shaped, brightly-glowing hands, robust bezel and curved crystal.

  • A proven, reliable movement (Seiko NH36A) with its own magnetism/shock resistant properties.

  • Domed sapphire crystal

  • 4’o clock winding and time/day/date setting crown.

  • 200m water-resistance

Specs and their implications

Water Resistance:

  • Water resistant up to 660 ft.

  • Suitable for professional and everyday use.

  • Suitable for Skin Diving, Scuba Diving, Deep diving, Swimming, Snorkeling, Surfing; spear-fishing; moderate to high-intensity land sports.


Ratio uses Japanese luminescent paint for the luminescence in the Freediver 200m watch. It is a non-radioactive, radiant paint that's applied generously on the hands and the indices of the Freediver. The paint exhibits greater intensity and longer-lasting luminescence. Its output duration doesn’t let you compromise on visibility; let it even be for a few extra hours in the dark! A 10-minutes long exposure to 500 lux or higher intensity light will charge the lume for the next 3-5 hours. A continuous 8-hour exposure to Sunlight on a normal summer day will let it glow for 10+ hours. The longevity of the paint is semi-permanent, ensuring full functionality of the watch even after years of active use.


  • Caliber: Seiko NH36A

  • Jewels: 24

  • Beat Rate: 21,600 bph

  • Accuracy: +20 seconds/day

  • Shock protection System: Diashock

  • ISO764 Anti magnetic standard compliant

  • Winding system: Magic Lever (Bi-directional rotor)

  • Power Reserve: 41 hours

  • Hacking/Hand-Winding


Analog, Black dial with large, prominent hour indices, covered from the top with a sapphire crystal.

Case, case back and bracelet material

316L Stainless Steel w/ Deployment Clasp

Other features

The 4’o clock screw-down crown is for time and day/date adjustments, placed in a manner that minimises damage to the watch in case of a frontal impact. It also eliminates the chances of bites if your palm folds against your wrist.

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