Rare June 1968 Seiko Automatic 6106-8100 Blue Dial Diver Watch 70m Proof RUNS

This particular Seiko 6106-8100 is an incredibly rare, first-year-of-production model dating exactly to June 1968. What makes this watch highly coveted among vintage watch enthusiasts is the early production "Water 70m Proof" text on the dial face. Seiko strictly used the "Proof" designation in 1968 and 1969 before the factory transitioned to "Resist" wording to comply with changing global regulations. Compounding its rarity is the exotic "Blue Chevron" dial featuring the prominent, dual-block lumed indices. While standard silver or charcoal dials are more common, the iridescent blue chevron variant is the absolute standout of the reference line and is increasingly difficult to find on the market—especially in fully operational condition with a 2019 service history.