Full Set 2002 Seiko Marinemaster 300 Ref. SBDX001 Automatic Diver | DC Vintage Watches
SEIKO Professional Diver 300 High Beat 6159-7000 Men's Watch From Japan G1217 | eBay
Topper Fine Jewelers - Seiko Diver's 300M (1968) - In 1968, Seiko released the Diver's 300M, Japan's first high-beat diver's watch. With a 10-beat caliber, monobloc case structure, rotating bezel, and screw-down