1 2

Ratio FreeDiver Helium Safe 1000M Stainless Steel Automatic 1066KE20-33VA-GRN Men's Watch

$268.00 SGD
Shipping calculated at checkout.
7 customer reviews
In stock

The Ratio Free Diver Helium Safe automatic watch offers an enjoyable and safe feel when you are deep down under water. It is surprisingly accurate and amazingly resilient to shocks and bumps, similar to other dive watches costing more than a few times. Its solid construction ensures a hassle-free dive while the helium valve is an added safety option that will keep your watch safe in case you decide to go for deep-sea diving.


Stainless Steel Case
PU Strap
Automatic Movement
Caliber: Seiko NH35
40 Hours Power Reserve
Sapphire Crystal
Helium Valve
Green Dial With Logo "RATIO"
Analog Display
Luminous Hands And Markers
Date Display
Screw Down Crown
Engraved Caseback (With Image Of A Free Diver)
Buckle Clasp
1000M Water Resistance
Approximate Case Diameter: 45mm
Approximate Case Thickness: 15mm


At our store, we value your satisfaction and want to ensure you are completely satisfied with your purchase. Therefore, we gladly accept returns and issue refunds for any purchase, subject to the following condition: the watch must be returned to us in its original and unused condition within 60 days from the delivery date. Read More


A two-year international manufacturer warranty. Read More


All of our products ship within 1-2 days. Free Shipping is Available Worldwide.


Ratio FreeDiver Helium Safe 1000M Green Dial Stainless Steel Automatic 1066KE20-33VA-GRN

The Ratio FreeDiver Helium Safe 1000M Green Dial Stainless Steel Automatic 1066KE20-33VA-GRN is for them who love to explore!

It is a watch that converts your exuberance towards unknown realms into a reality!

The FreeDiver Helium Safe 1000M offers you newer chances and challenges amidst newer depths and dimensions.

You never know what or where your curiosity might lead you next! So we made a watch that can take you beyond the maximum Freediving limits if needed; we made it for explorers with inquisitive minds.

6 reasons why you should go for the Ratio FreeDiver Helium-safe 1000M watch

  • A well-done watch that’s solidly constructed, the Ratio FreeDiver Helium Safe 1000M Green Dial Stainless Steel Automatic is an all-around instrument for marine enthusiasts and desk-divers alike. This one joined the hit parade immediately after the 200m Freediver made to the scene and became an instant hit.

  • This excellent tool/diver watch makes you aspire for deeper underwater realms. It has amazed everyone with its wide depth range and features. It surfaces for everyone who looks forward to newer experiences perilous yet pleasurable.

  • The Ratio FreeDiver Helium Safe 1000M Green Dial Stainless Steel Automatic 1066KE20-33VA-GRN is a heavy watch. The heavy-gauge surgical steel construction (case, screw-down crown, engraved case-back w/image of a free diver and the deployment clasp) gives it the weight. It pleasantly assures its presence with its heft while increasing the momentum of your hand’s movements, rather than tying you down with its weight. The thick gauge, surgical-grade stainless steel and the sapphire crystal offers high resistance against tremendous water pressure; physical impacts and violent tugs. The crystal, the case and the case back protect the Japanese mechanical movement (with its own shock/magnetism resistant features) within entirely against knocks, bumps and drops.

  • A large sized dial made of brass and painted using silkscreen technique; a big date window and prominent hands and hour markers offer maximum visibility under murky environments and when under pressing situations, you do not have to squint to focus on the dial to read the time (or the bezel/timer reading). A big advantage is the non-radioactive 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, the grooved crown and the knurled helium-valve cover – All facilitate a firm grip with wet fingers, with or without the diving gloves on. It is advised not to operate the crowns under wet conditions. Note: You’ll need the helium valve in your watch for times when you are in a chamber filled with breathing mixture; not necessarily diving bells. You open the valve to let the trapped helium out, which got past the gaskets and seals due to their very fine dimensions. A decreasing external/environmental pressure would make the helium to expand fast and damage the seals, crystal and gaskets in an attempt to escape. The helium valve provides an outlet for the built up pressure to escape.

  • The hour and minute hands of the Ratio FreeDiver Helium Safe 1000M Green Dial Stainless Steel Automatic 1066KE20-33VA-GRN are unique in their shapes. The hour and minute hands are a mix between arrow and sword shapes while the seconds-hand is an improvisation on the sword-style. The red-border on the minutes hand ensures you do not miss out on its position while using the bezel as an elapsed-time indicator.

Ratio FreeDiver Helium Safe 1000M Green Dial Stainless Steel Automatic : A sum up of time and personal experiences

The Ratio FreeDiver Helium Safe 1000M Green Dial Stainless Steel Automatic is a great tool watch to which anyone who takes freediving seriously should give a thought. Its specs match that of any pro-grade diver watch but the cost doesn’t. The Ratio FreeDiver Helium Safe 1000M Green Dial Stainless Steel Automatic 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.

Specs and their implications

Water Resistance:

  • Water resistant up to 3300ft (1000m).

  • 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 non-radioactive luminescent paint for the luminescence in the Freediver 1000m 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 NH35

  • 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

FreeDiver Automatic 1066KE20-33VA-GRN Men's Watch
FreeDiver Automatic 1066KE20-33VA-BLU Men's Watch
FreeDiver Automatic 1066KE20-33VA-BLK Men's Watch
Case Size 45mm 45mm 45mm
Automatic Movement
Functions Date, Hour, Minute,
Date, Hour, Minute,
Date, Hour, Minute,
Features Analog Display Analog Display Analog Display
Band Material Polyurethane Polyurethane Polyurethane
Crystal Sapphire Sapphire Sapphire
Water Resistance 1000M 1000M 1000M
Engine Caliber: Seiko NH35 Caliber: Seiko NH35 Caliber: Seiko NH35
Dial Color Green Blue Black

Prime points

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

  • Visually appealing watch face with uniquely shaped hands.

  • A proven, reliable movement (Seiko NH35) with its own magnetism/shock resistant properties.

  • Sapphire crystal

  • 1000m water-resistance


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

2 and 4’o clock crowns: The 4’o clock screw-down crown is for time and date adjustments while the 2’o clock screw-down crown is the helium escape valve. They are placed in a manner that minimises damage to the watch in case of a frontal impact and eliminate the chances of wrist bites if your palm folds against your wrist.

Customer Reviews

Based on 7 reviews
Initial impressio...luv,luv,luv

As you can guess from the headline I luv this watch. Only had it a few hours but love the weight,size color and band.The only knock I can give it is not so much the watch but the description. States that the bezel is bi-directional it is not ... at least on the watch I received. Whether it's a typo with the maker or a flaw on the watch I received it's not a deal breaker with me either way, unless it's a sign of things to come. If that's the case i will be the first to call Ratio II out on it.


Exactly what I ordered!!! - Dimensions exact. Movement exact. Excited to field test the watch. Exactly what I wanted.

Jamás recibí el paquete

Excelente - Muy buena calidad,cumple mis expectativas


Absolutely a beautiful watch. This my second dive watch and I have to say, this one is my favorite, at least for now. Wonderful service and fast shipping. Will purchase again in the near future.

Ignazio Culella

This is my second Ratio. Great Watch!!! Thanks