Omega Seamaster Grand Luxe ~ 1957

Hey Omega family,

I'm looking at this old vintage omega seamaster Grand luxe. I know they have the 503 cal but I haven't seen any SM's with the Grand luxe branding. I'm wondering if anyone can tell me more about this watch I tried searching the forums but there's not much info regarding the seamaster Grand luxe date. I will try to update with more pictures but wanted to see if anyone can tell if this is original or if there's something wrong with the watch.

Thank you

They were from American market.
Grand Luxe but they have 14k gold capped case with SS case back. Not 18k solid gold case.

https://omegaforums.net/threads/seamaster-grand-luxe.5304/