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