Omega Geneve caseback stamp

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Hi,

I bought an Omega Geneve from 1969. THere is a stamp on the caseback (triangle/circle) that I don't know. What is it ?



thanks !!
Jacques
 
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It signifies that the case was made for Omega by EPSA, or AKA Ervin Piquerez SA.
 
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Thansk, I did not know the stamp of all the case manufacturers. Now I know EPSA, or AKA Ervin Piquerez SA