WatchSpecDBwatches, by spec

Seiko Prospex Willard SPB153 vs Seiko Prospex Monster SRPD25

Both are dive watches in the mid tier — here's how the specs differ and which to pick.

Last verified 2026-06-11 · specs from manufacturer data · tier = price band, confirm the live price at the retailer

SpecSeiko Prospex Willard SPB153Seiko Prospex Monster SRPD25
MovementAutomaticAutomatic
Water resistance200m200m
Case size43mm42mm
Crystalsapphirehardlex
StyleDiveDive
Price tierMidMid

Which should you buy?

Where to buy

Check the Seiko Prospex Willard SPB153 price on Amazon →

Check the Seiko Prospex Monster SRPD25 price on Amazon →

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.

FAQ

What's the difference between the Seiko Prospex Willard SPB153 and the Seiko Prospex Monster SRPD25?
Both are dive watches in the mid tier. The Seiko Prospex Willard SPB153 is automatic, 200m water resistance, 43mm, sapphire crystal; the Seiko Prospex Monster SRPD25 is automatic, 200m water resistance, 42mm, hardlex crystal.

Which is better value, the Seiko Prospex Willard SPB153 or the Seiko Prospex Monster SRPD25?
Both sit in the mid tier, so it comes down to movement, water resistance and case size — see the spec table above.

More dive comparisons: Casio Duro MDV106 (Marlin) vs Orient Ray II · Seiko Prospex Turtle SRPE vs Seiko Prospex Solar Tuna SNE575 · Seiko Prospex Sumo SPB103 vs Casio G-Shock Frogman GWF-A1000 · Casio Duro MDV106 (Marlin) vs Orient Mako II · all dive watches · all comparisons