Seiko Prospex Marinemaster 300M Automatic American From the outside in

From the outside in

its silvery hue accented by the brightly polished hour and minute hands and blued steel chronograph and subsidiary seconds hands

even the 6159 proved no match to the rigors of saturation diving

This particular example is fitted with the Valjoux 72

Seiko Prospex Marinemaster 300M Automatic American From the outside inWhy We Love It By now, our love for Seiko (new and old) should be apparent. From the rare as hen's teeth Hi Beat 6159 to the film famous 6105 and 6309 models to the economy workhorse SKX007, Japanese watchmakers perfected incredibly well made tool watches decades ago and at prices that make the most diehard Swiss watch fans bristle with jealousy. An update to the Seiko MM300, the SBDX017 was extremely popular while Seiko was producing it. Once it was