Rolex 1675/3 GMT

Hi guys. I came across this vintage piece that I have always wanted at a reasonable or one could say a stealing price. But the stamp on the case back looks abit suspicious to me and I have seen incredibly real franken. Anybody could lend an eye?

Thanks!

Any thing else you spotted?

Can elaborate more? So that I can learn what to look at if possible…thanks

consulted a friend, its a franken with viet midcase and caseback…

will confront the seller first and later on i will post photos