Seiko Watchesのインスタグラム(seikowatchusa) - 10月31日 05時43分

I had the privilege of meeting Ikuo Tokunaga, the Seiko engineer who was behind the 1975 600 meter Professional Diver, aka the “Grandfather Tuna”, which introduced more than 20 patents for its innovations. Here it is (on the left) with my own Marinemaster 1000m. #behindtheface #watchfam #wotd #seikodiver #divewatch #prospex #marinemaster #tuna

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