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I am a sucker for this kind of inscription.
Some more info on the Omega Ultra thin movements can be found on Desmond’s fantastic web site - here
http://download1595.mediafire.com/d6l5gaucwytg/f2wh10fa1rtxe85/Omega Constellation UltraThins of the Sixties and Seventies_June2013.pdf
If anyone else has a cal 710 would you please post some pics of the watch? I would love to compare to mine..