Stage 2 (1950s - 1960s) | History of Seiko and Its Products | THE SEIKO MUSEUM GINZA
Late 1950's Seiko Marvel Mechanical | DC Vintage Watches
Collector Guide Birth-Year Seiko Watches: 1960-1969 - BEYOND THE DIAL
No. 472 / Seiko Marvel - 1961 – From Time To Times
Very RARE vintage SEIKO Unique 15J 1950 | eBay
Thomas Timepieces on Twitter: "Manufactured in the late 1950's by the Kameido factory, this manual wind Seiko Unique still keeps excellent time (after a well-earned service) comparable to a modern mechanical watch,