Is this Vintage Omega 1950's Automatic Seamaster genuine or replica?

Hello please can anyone tell me if this is a genuine vintage Omega seamaster and if the parts are original i.e redial or anything. I am potentially going to purchase the watch today and want to know if it is worth buying. Really appreciate your comments and opinions/
Kind Regards
Abs

Part of why I'm here is to learn so wait for an answer from someone that's a "bit" more experienced than me...

Can't say if the parts are genuine Omega parts but it seems like someone pieced together different parts from various models.
The case back belongs to a calendar automatic and this one is lacking the calendar feature.
Also the seconds hand doesn't look original to me.
The leather strap is not an Omega strap.

Again, I can't say if it's fake but I think is not original.

To be honest you were very correct in your answer, it took me about a minute to find out what I wrote above...
Nothing was based on previous knowledge about this watch.