The history of Seiko Dive Watches goes back to 1965 with their very first model. From then on Seiko have lead the way in innovation, design technology, materials and style. You may have already looked at the Seiko Tuna and Samurai divers’ watches – here we look at the Seiko Turtle dive watch.

Seiko Turtle – quick links

An introduction to the Turtle

In 1976 Seiko released the first of their “cushion cased” or “turtle shell” style diver’s watches. The Seiko 6306 & 6309 were produced from 1976 (1) until 1988. Recognisable from their soft cushion shaped case these watches also featured a recessed crown at the 4 o’clock position and day / date indicators. Both models were driven by an automatic (mechanical self wind) movement.

Seiko Turtle dive watch with distinctive shell / cushion shaped case
Seiko SRP777K1 – automatic 200m divers watch

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Recently Listed for Sale

Click the links below to browse the latest Seiko Samurai dive watches added to in the last couple of days. Watches have been sorted to sellers from the UK and the USA. It’s worth checking both categories as many sellers will ship worldwide.

UK – Seiko Turtle Dive Watches listed for sale

USA – Seiko Turtle Dive Watches listed for sale

Specification (current models)

The Seiko Turtle was re-introduced in 2016. Available in 4 variants

  • steel with black dial / bezel (SRP777)
  • steel with black / gilt detailing (SRP775)
  • steel with blue detailing (SRP773)
  • steel with “pepsi” red & blue detailing (SRP779)

Since then Seiko have added a couple of new variants

  • steel with PADI red & blue details (SRPA21K1)
  • all black tactical version (SRPC49K1)
Seiko Turtle dive watch in tactical all black colours
Seiko SRPC49K1 – the Tactical Turtle in all black


  • Case Material : Stainless steel
  • Glass Material : Hardlex
  • Band Material : Silicon
  • Case Thickness : 13.4㎜
    Case Diameter : 45㎜


Other Details

  • LumiBrite : Lumibrite on hands and indexs
  • Water Resistance : 200m / 660ft diver’s


  • 24 jewels
  • Day/Date display
  • Screw case back
  • Stop seconds hand function
  • Unidirectional rotating bezel

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Old Turtle versus New Turtle

The main differences between the new Seiko Turtle watches and those from 1978 to 1988 (6306 / 6309) are as follows (2)

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Video Reviews

Seiko Turtle PADI SRPA21K1 Prospex Review

YouTube video

John Egerton’s thoughts on the popular PADI Turtle re-issue from Seiko. Is it worth it?

Seiko Prospex SRPA21 “PADI Turtle” One Week On the Wrist

YouTube video

Ankit Blanket’s review of the Seiko SRPA21 “PADI Turtle” dive watch after one week …

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Authorised Seiko Prospex shopping partner

Our online shopping partner sells the entire range of Seiko Prospex dive watches. Shop with confidence at Jurawatches. Get the assurance of a genuine Seiko Prospex watch from an authorised dealer.

This is what our shopping partners say about the Seiko Prospex range

“Discover our stunning collection of Seiko Prospex watches designed especially for sport lovers and adventurers in mind. Since the first Seiko Prospex Divers watch was released in 1965, the brand have continued to challenge and expand on their designs to create a range of Japanese diving and sport watches that provide exceptional functionality and striking visual appeal”

Spring Bars (watch strap pins)

A pair of Spring Bars / strap pins suitable for a Seiko Turtle dive watches - 22mm x 2.5mm
FAT Spring Bars for Seiko Turtle Dive Watches

We sell replacement spring bars suitable for Seiko Turtle dive watches. These high quality stainless steel pins have been made to the same dimensions as the original Seiko C220FS part. The main dimensions of the FAT Seiko spring bar have been reproduced here:

  • High quality – rust proof stainless steel
  • Primary diameter = 2.5mm
  • Width when 95% compressed = 22mm
  • Pip diameter (the end that locates in lugs) = 1.1mm
  • BUY NOW >> 22mm FAT Seiko Turtle Spring bars
22mm wide watch spring bar for Seiko Turtle Dive watches
22mm Wide Spring Bars for Seiko Dive Watches
2.5mm diameter FAT watch spring bar for Seiko Turtle
2.5mm diameter Spring Bars
Spring bar features a 1.1mm pip to fit the lugs of the Seiko Turtle
1.1mm Pip diameter to fit Seiko Turtle lugs

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If you found this page via a search engine – please pop over to our generic Seiko Divers watch page. You will find plenty more information on iconic styles from Japan’s leading manufacturer of quality dive watches. The complete current range has been summarised here – Seiko Prospex Dive Watch range

External references / further reading

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