Hello! Can someone tell me what I have?

I inherited this watch from my grandfather and I know nothing about it. I had the back popped off and the 2 numbers inside it are:

47036913
1020




Excuse the band weirdness. I had a local leather guy try to make a band for me but it didn't pan out. I could actually use some help finding a band, too, if anyone is so inclined. I'm thinking of staying with dark brown leather and a brass/gold clasp. I'm looking for something that doesn't taper; the same width the whole way through. The post width on this watch is 18mm.

Thanks all!

Correction... an Omega watch.

It is an Omega Automatic Watch.
The #1020 is the movement number and 47036913 is the serial number. It dates back to the mid 1980s.
It probably has a gold plated case and is worth around $200-$300 if it runs and you get a new band for it.