If you’re after Seamaster dress watches I would narrow it to the 60s ideally as they have a good balance of availability, water resistance (relative to 50s), originality and durability yet are still affordable.
The two I would look more closely at are front loading Seamaster / Seamaster DeVille models with Calibre 550/552/562/564, and also the Seamaster “sparkle” in Calibre 564, 751 & 752
They’re all good movements and good secure cases with higher than average odds of getting an original dial.
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