Seiko Prospex SRP653K1 Blue Baby Tuna Special Edition 50th Anniversary 50mm


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The Seiko ‘Baby Tuna’ is back and more strong than ever. The watch that is known with this nickname is a true icon from the Japanese brand Seiko, the affordable edition of the impressive and professionally oriented MarineMaster Tuna, with its very qualitative construction. However, the Seiko Prospex Automatic Diver 200m ‘Baby Tuna’ might be a lot cheaper, it also has the ‘Prospex’ (meaning the Seiko Professional Specification) name written on its dial and all the attributes of a proper Seiko: solid, fully developed and manufactured in-house and a great value for money. Say hello to the new 2015 Seiko Prospex Automatic Diver 200m ‘Baby Tuna’ 4R36 ref. SRP653K1 (blue). 

The new Seiko Prospex Automatic Diver 200m ‘Baby Tuna’ introduced during Baselworld 2015 is clearly a watch that collectors with smaller budgets will for sure like – and buy.

This new Seiko ‘Baby Tuna’ (as collectors like to call it) is part of the Prospex collections, meaning that it fulfills the difficult Seiko Professional Specifications. Everything started back in the 1960s, when SCUBA diving was on the rise. In 1965, Seiko introduced their first professional dive watch, the renown 6217, with a rotating bezel and a 150m water-resistance. From now on, a part of the collection was build with the only intention to seduce professional divers and to fulfill their needs with purposely build watches. PROSPEX watches are not to be confused with Seiko’s standard mechanical line-up of watches. The build quality of these watches are far from cheap and Seiko’s PROSPEX is also one of the leading innovators in terms of dive watch advancement. Knowing that the 2015 Seiko Prospex Automatic Diver 200m has this mention on its dial should be the insurance of quite an interesting watch.
What is it about? This 2015 Seiko ‘Baby Tuna’ is the new edition of an icon, a watch with a true aura and its very personal design, recognizable among dozens of divers. It’s also a beast with its 50mm case. But once again, it’s part of its DNA and its purpose. The 2015 ‘Baby Tuna’ comes with the specific case, composed of a round stainless steel central part, with a curved caseback – a case called ‘scallop’ – that shows no protruding lugs. The other specification of this watch is the shape of its upper case, with an incomplete shroud that both protects the case and rotative bezel and also allows to perfectly grip this bezel, even with diving gloves (don’t forget the professional orientation of this watch). This added protective shroud is made of Stainless steel with a black or blue ‘Hard-Coating’ that should be ceramic (as the caseback indicated the use of such material). Previously made of plastic, this new material increases the overall quality.
The bezel is classical, as it rotates unidirectionally and its engraved with a 60-minute scale. Its is made of metal coated with a glossy blue laquer and large white markers and numerals. It also has some large and easy to grip deep groves to facilitate the prehension. The bezel is thus easy to operate and to read. This also goes for the dial. With its large luminous indexes and hands, it is a legible and practical tool even under the deep blue seas. Compared to the previous edition, the indexes are now round and triangular (for the quarters) instead of straight batons. The hands are also large and highly legible. As usual, the caseback and the crown are screwed to ensure the 200m water resistance.
Inside the ‘scallop’ case ticks a well known self-winding movement, the Seiko 4R36, a 24 jewels calibre, with hand-winding capability and 41 hours of power reserve. It ticks at a reasonable 21.600bph. This movement introduced in 2011 replaces the iconic 6R15 (that finds its roots in the 7S26 that equipped a large part of the Seiko divers from 1996 to now, including the very cool Seiko SKX007 and as it shares lots of its specifications, we can expect this 4R36 to be also reliable and efficient. As every of the movements cased into a Seiko, we’re talking about real in-house / manufacture movements, meaning that it was fully designed, developed and build by Seiko, with the rigorous Seiko standards. The Seiko 4R36 displays the hours, the minutes, the seconds on the central axis and two calendar indications; the date and the day, in a window at 3.
With a 50.2mm diameter, we won’t hide the fact that the Seiko Prospex Automatic Diver 200m ‘Baby Tuna’ is a huge watch – not to say a monster. It will certainly be more practical over a diving suit than on the wrist of an elegant gentleman wearing a tuxedo. However, this size is part of the DNA of the ‘Baby Tuna’ and, thanks to the curved caseback, to the soft silicone band and to the lack of external lugs, the comfort is here – and considering the success of the previous editions, this diameter will never be a barrier for collectors.


Awesome Seiko Prospex 1968 Sea Mechanical Automatic! Awesome Blue bezel!

BRAND: Seiko

MODEL: Prospex Special Edition SRP653K1

MOVEMENT: Automatic – Japanese

CASE: Stainless Steel

CROWN: Screw Down Crown

SIZE: 50.2mm

LUGS: 22mm – fitted

DIAL: Blue Dial

BEZEL: Blue rotating Diver

CONDITION: Pre-owned – very good – slight marks on crystal

BOXES/PAPERS: Yes/Yes: Seiko Box Set with watch etc – everything as shown in pictures!


STRAP/BRACELET: – Original Seiko Black Silicone Rubber strap with Signed Seiko Steel buckle.

Trades welcome!!


We buy similar watches…large packages as well as one at a time. We also take trades against any of our watches…

Let us know what you have in your collection!! I consider all watches in trade! Please upload pictures and include details of your trades through my Trade/Buy tab at the top of my homepage.