When was EGB 765 pendant necklace made?

by Lina
(Warsaw, Poland)

Dear Sir/Madam,

Please help me to find out what these marks on the jewelry

stands for? I know this piece is old and 765 is 18Ct gold (higher than 750), but can you tell me more about the time it is made? What is EGB?

Thank you,

Best regards,
LL