help with the vintage watch and buckle

hello
maybe it is a vintage buckle in 1960s.


on the back of buckle carved "aw/swiss/depose". the seller told me its a vintage buckle of PP.
but i donot think so.
1. there didnot have "pp_co" or "ap&co" mark on the buckle, may be its vintage vc buckle
2. there didnot have "acierinox" or "750" on the buckle,i didnot see a aw buckle without material mark!The following picture is a vintage steel vc buckle in 1970.


Logically, it is a fake or a rare genuine product. Please tell your opinion.

the caliber is so beautiful 👍 it was made in later 1940s ?
and i donot know if the dial is original. maybe the AP signature shoule be "AUDEMARS . PIGUET"?
i want to know when the signature from "AUDEMARS . PIGUET" to "AUDEMARS PIGUET" ?
thank you 😀