IWC, International Watch Co., Schaffhausen, Da Vinci, Quartz Electronic, Ref. 3501. Fine, center-seconds, water-resistant, [..]
Dial, case and movement signed, in good condition
NOTE: The firms IWC, Patek Philippe, Piaget, Rolex with other Swiss manufacturers became part of a new company Electronic Watch Centre (CEH) to jointly study a quartz wrist calibre. Developed and finished after one year of research, the calibre Beta 21 was ready for production in 1969 and was presented at the Basel Fair in 1970.