Seiko SRPD55 Black Boat Master Mod


A custom Seiko SRPD55 Black Boat Master Mod. Timeless black and steel.

Both the crystal and bezel insert feature increased scratch resistance materials.

The chapter ring and bezel have been modified with new 316L stainless steel parts.

This watch will stand up to most thing life can throw at you, in the city, the wilderness or at sea.

Like it, but it needs a little tweak? Please get in touch.





The Seiko SRPD55 Black Boat Master Mod. Mix of steel and black to create the classic style. The crystal and bezel insert have been upgaded to increased scratch resistant materials. There are some variations of this mod so be sure to check the other watches on offer or get in touch if you are looking for something just for you.


Double dome sapphire crystal with blue anti-reflective coating. (AM)
Sloped ceramic insert. (AM)
Polished stainless steel bezel with sub style grip/fluting. (AM)
Brushed stainless steel chapter ring. (AM)
Rubber Two Piece Strap. (AM)


Calibre: 4R36
Movement Type: Automatic with manual winding
Power reserve: Approx. 41 hours
Jewels: 24
  • Stop seconds hand function
  • Day/Date display


Case Material: Stainless steel
Case Size: Thickness:16.05mm, Diameter:42.5mm , Lug-to-lug:46.0mm
Crystal: Sapphire (Double Dome)
Band Material: Rubber
Distance between lugs: 22

Other Details

Water Resistance: 10 bar
  • Unidirectional rotating bezel
  • See-through & Screw case back

Seiko SRPD55 Black Boat Master Mod

All “Seiko Mods” sold by WellingTime began their life as a Seiko watch in a Seiko factory somehwhere in Asia. These are sourced though authorised distributors here in the UK and come complete with original box, packaging, paperwork any tags etc.

All base model Seiko watches and modified parts are in stock. Delivery will be made within 7-10 days for UK customers and 3-4 weeks for customers from abroad. You will be informed when your order has been received and given an expected delivery date. After your watch has been modified you will have your delivery date confirmed along with a Royal Mail or DHL tracking number.

All “Seiko Mods” sold on the website come with a 24 month warranty. The warranty is supplied by WellingTime as the manufacturer (Seiko) will no longer offer warranty to modified watches.

Where possible all Modified Seikos (Seiko Mods) will have modifications made to the original parts or be modified with additional OEM (Genuine) Seiko parts. Some modifications require the use of what maybe refered to as “after market parts”. These are parts not manufactured by Seiko although every effort is made to ensure high quality replacment parts. These are sourced from long term trusted suppliers and will be marked in the product description with the letters “AM”.

WellingTime has no affilliation with Seiko or any other brands.


Additional information

Weight 700 g


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