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Very nice. I have one too, pics here https://www.instagram.com/p/Bvzp29snsYX
it's a ref. 166.072. They're not common watches actually. If you want to look up some info this is a great read http://www.mediafire.com/file/q5zjoyznxgj/Omega%20Seamaster%20Memomatic%20Watch.pdf
You'll also find more by searching the movement reference which is quite special, it's a Cal.980 which is a Lemania 2980. Don't be tempted to polish or do anything to the case, yours is quite sharp and the original factory brushing + authentic wear makes it quite collectible.
Twas dad's, no idea where he acquired it. He decided he liked his citizen/didn't care about watches so I got lucky, I had to get it serviced to fix the alarm and I think it was it's first in 30 years.
Got his Breitling Top Time and little (broken) Oris too.
I have a beautiful 50/60's IWC dress watch from my wife that is actually my daily wear.
I'm currently considering whether I can justify a Milgauss and /or speedie, as a daily. These watches are all too sentimental, ha.