Thank you guys!! As i was thinking,it is a custom made case and band,testet with xrf to verify if it is a 18k solid parts without damage,i am located in israel and bought it from a private person,not from store or some private dealer,it was passed to him from his family,the mechanism and dial look genuine to me also,because the mechanism have all marks serial etc,just wanted to be sure because i am not an expert im new into watches,is my second good watch,the first one was omega smp the biggest size and i fell in love with the brand 🥰,think i was lucky on this purchase because i paid for it only 4250$ and on local omega group on FB someone offerd me about 7300$ , not planning to sell it i think it is still a rare piece and work of art altough its not 100% genuine because of the case and band