Pictures are a bit blurry but it seems you have there a very nice 18k (0,750) cased IWC from the 50's with a pie pan dial and a pellaton cal 8521 movement. Albert Pellaton was technical director of IWC Schaffhausen from 1944 until 1966. Crown looks to be replaced. Great heirloom. Give here a service, a great brown/cognac strap (or whatever you like) and wear the heck out of it.
Do you have a straight up picture of the dial?
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