http://www.electric-watches.co.uk/ma...icoh/ricoh.php
In 1962, Hamilton entered into a joint venture (60% owned by Hamilton) with the Japanese watchmaking firm Ricoh to produce electric watches meant primarily for the Japanese market. The electronic components were produced at Hamilton's Lancaster factory while production of the mechanical works and final assembly was undertaken in Japan. Although production levels of Hamilton-Ricoh watches was high (over 1000 per month), demand was low and consequently, the Hamilton-Ricoh partnership was unable to compete with the substantial market presence of Seiko. The partnership was dissolved in 1965, with the remaining Hamilton-Ricoh electronic movements (marked "Ricoh 555E") re-cased as "Vantage" and sold in the US.
