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It's called the Beta 21 (13-Jewels) and was the fist commercially produced Swiss quartz movement used in Swiss timepieces. It was produced by a conglomerate of Switzerland's biggest Watch Companies under the direction of the Centre Electronique Horloger (CEH). The movement was released to the public at Basel in 1970. No less than 16 brands used this Quartz movement including Omega, Rolex, and Patek Philippe.
Here's some reading on the Rolex version . . . http://www.oysterquartz.net/the_quartz_date_5100.htm
Here's an owner's manual for the Omega Constellation . . . http://www.old-omegas.com/f8192en.html
I owned 2 of these watches . . . an 18kt Patek Philippe, and an all SS Omega Constellation. Eventually, selling both of these watches afforded my new bride (at the time) and I a sizable down payment on our new house!
There are several available on eBay if you want to check them out . . .
http://cgi.ebay.com/PATEK-PHILIPPE-VINTAGE-GOLDEN-CIRCLE-18K-RARE_W0QQitemZ170278050878QQcmdZViewItemQQptZWristwatches?hash=item27a55cdc3e
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=150381898939&ssPageName=STRK:MEWAX:IT
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=200402592805&ssPageName=STRK:MEWAX:IT
This is a pic of the movement from my Patek . . .
It's called the Beta 21 (13-Jewels) and was the fist commercially produced Swiss quartz movement used in Swiss timepieces. It was produced by a conglomerate of Switzerland's biggest Watch Companies under the direction of the Centre Electronique Horloger (CEH). The movement was released to the public at Basel in 1970. No less than 16 brands used this Quartz movement including Omega, Rolex, and Patek Philippe.



Here's some reading on the Rolex version . . . http://www.oysterquartz.net/the_quartz_date_5100.htm
Here's an owner's manual for the Omega Constellation . . . http://www.old-omegas.com/f8192en.html
I owned 2 of these watches . . . an 18kt Patek Philippe, and an all SS Omega Constellation. Eventually, selling both of these watches afforded my new bride (at the time) and I a sizable down payment on our new house!
There are several available on eBay if you want to check them out . . .
http://cgi.ebay.com/PATEK-PHILIPPE-VINTAGE-GOLDEN-CIRCLE-18K-RARE_W0QQitemZ170278050878QQcmdZViewItemQQptZWristwatches?hash=item27a55cdc3e
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=150381898939&ssPageName=STRK:MEWAX:IT
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=200402592805&ssPageName=STRK:MEWAX:IT
This is a pic of the movement from my Patek . . .


