WatchSpecDBwatches, by spec

Seiko Prospex Samurai SRPB51 vs Seiko Prospex Willard SPB153

Both are dive watches in the mid tier. In short: the Seiko Prospex Willard SPB153 has a sapphire crystal — more scratch-resistant for daily wear. The Seiko Prospex Samurai SRPB51 is automatic, 200m water resistance, 43.8mm, hardlex crystal; the Seiko Prospex Willard SPB153 is automatic, 200m water resistance, 43mm, sapphire crystal.

Last verified 2026-06-27 · specs from manufacturer data · tier = price band, confirm the live price at the retailer

SpecSeiko Prospex Samurai SRPB51Seiko Prospex Willard SPB153
MovementAutomaticAutomatic
Water resistance200m200m
Case size43.8mm43mm
Crystalhardlexsapphire
StyleDiveDive
Price tierMidMid

Which should you buy?

The Seiko Prospex Willard SPB153 has a sapphire crystal — more scratch-resistant for daily wear.

Where to buy

Seiko Prospex Samurai SRPB51See price on AmazonCheck price

Seiko Prospex Willard SPB153See price on AmazonCheck price

As an Amazon Associate we earn from qualifying purchases, at no extra cost to you. Affiliate links never affect our specs or which watches we compare.

Ordering a watch? Amazon Prime includes fast delivery on eligible items, and eligible new members may be offered a free trial. Delivery speed and return terms vary by item, so check the listing when sizing is a gamble. See if you can try Prime free →

Affiliate link — we may earn a commission on qualifying sign-ups, at no extra cost to you. Current terms are on Amazon's page.

Neither of these quite right? Answer five questions — wrist size, what it's for, battery or automatic, whether it gets wet, budget — and see which of the 128 watches actually fit →

FAQ

What's the difference between the Seiko Prospex Samurai SRPB51 and the Seiko Prospex Willard SPB153?
Both are dive watches in the mid tier. The Seiko Prospex Samurai SRPB51 is automatic, 200m water resistance, 43.8mm, hardlex crystal; the Seiko Prospex Willard SPB153 is automatic, 200m water resistance, 43mm, sapphire crystal.

Which is better value, the Seiko Prospex Samurai SRPB51 or the Seiko Prospex Willard SPB153?
Both sit in the mid tier, so it comes down to movement, water resistance and case size — see the spec table above.

Citing these specs? Go ahead — manufacturer data, last verified 2026-06-27. Copy a ready-made reference:

More dive comparisons: Casio Duro MDV106 (Marlin) vs Orient Ray II · Seiko Prospex Turtle SRPE vs Seiko Prospex Solar Tuna SNE575 · Christopher Ward C60 Trident vs Marathon TSAR · Seiko Prospex Sumo SPB103 vs Casio G-Shock Frogman GWF-A1000 · dive watches under ~$600 · all dive watches · all comparisons