39.5 MM · AUTOMATIC
Seiko
Prospex Alpinist
SPB121J1
Est. market value—
—last 30 days
Japan · EST. 1881
Seiko
Japanese ingenuity, unmistakable character. From purpose-built divers to everyday classics, discover the references that have earned a place in generations of collections.
2 tracked references
YOUR NEXT FAVOURITE
2 references Seiko watches
42.5 MM · AUTOMATIC
Seiko
5 Sports Automatic
SRPD55
Est. market value—
—last 30 days
EXPLORE SEIKO
A guide to the Seiko references tracked here
WristMarkets currently covers 2 Seiko references. This is a selected catalogue, not the manufacturer’s complete range. The references below use automatic movements, with case diameters from 39.5 to 42.5 mm.
Compare Seiko watches by reference
The reference identifies the watch more precisely than its collection name. Compare case size, movement and dial first, then open the exact reference for its specifications, sources and available buying or selling offers.
| Watch / reference | Case | Movement | Dial |
|---|---|---|---|
| Prospex Alpinist SPB121J1 | 39.5 mm | Automatic · 6R35 | Green |
| 5 Sports Automatic SRPD55 | 42.5 mm | Automatic · 4R36 | Black |
Which Seiko price am I seeing?
Prices marked Retail are external retail references. Community asks and bids are separate expressions of selling and buying interest. Availability, condition and the seller’s currency matter when comparing offers; a listed price is not a completed sale.
Read the pricing methodology →How do I choose a reference?
Start with the case size and movement that suit your use, then compare individual references and accessories. Catalogue dimensions do not replace a fit check. A similar name or dial colour does not establish that two references are identical.
Browse Seiko listings →Updating results…