Omega Constellation 1961070 - need info, please!

Hello, i have an Omega Constellation and i would like to have more info about the watch and price, because i couldnt find to much online... So i know that the model of the watch is 1961070, i went to omega website to compare it, and i've seen small differences like there its written it's a gold watch, but mein has the back case made of "acier inoxidable", also on omega website i've seen it with different models of bracelets, but no one similar with mein... Also the bracelet doesnt have omega mark, but has a small 750 mark... is it gold? why i cant find info on the oficial website? i wold like to know about the value of this watch. please any info it's wellcome. Thank you.