This was my Dad's Omega, he passed in 1980. Wondering which model it is. Number on back is 1584131, serviced 5/8/62 (scratched in back). Swiss, 17 jewels, number on movement is 11376513. Also OXG. It is working but needs to be cleaned. Thanks for any help.
The number inside the case is the model. 1584131 In watch language, "reference" is used instead of "model."