Side-by-side at a glance. Click a watch above to open the full reference page.

	Seiko SPB153J1	Seiko SPB413J1
Model	Prospex 1970 Willard Re-creation SPB153	Prospex 1970 Willard Re-creation SPB413
Caliber	Seiko Cal. 6R35 -- in-house automatic, 28,800bph, 70h PR, 24j; hackable, manual-wind; upgraded from 6R15; used widely in Presage and Prospex lines	Seiko Cal. 6R35 -- in-house automatic, 28,800bph, 70h PR, 24j; hackable, manual-wind; upgraded from 6R15; used widely in Presage and Prospex lines
Case size	42.7mm	42.7mm
Lug-to-lug	48mm	48mm
Years produced	2020–present	2023–present
Brand tier	enthusiast	enthusiast
Era	modern	modern
Movement tier	Unclassified movement	Unclassified movement
Market median (excellent / full-set)	n/a	n/a
Typical range	n/a	n/a
Confidence	low	low
Categories	dive, sport	dive, sport
Editorial	yes	yes

Seiko Prospex 1970 Willard Re-creation SPB153 vs Seiko Prospex 1970 Willard Re-creation SPB413