So sorry for your loss. You have a wonderful watch to remember him by. It is also quite valuable. You want to get it serviced though. You can't just let anybody work on it and certainly not by Omega. The Omega watchmakers will want to make it look like new. They will polish the case (bad), replace the dial and hands (very very bad), replace the pushers, crystal and crown (normal wear items). It is a very nice example of an untouched 145.012-67, possibly a 105-012-66 with an HF case or a 145.022-68 transitional. The first two models have a c321 movement, the last a c861 movement. The sweep second hand is incorrect for a c321 watch but is correct for a 145.022-68. It looks to be as aged as the hour and minute hands so I think it is most likely a 145.022-68 transitional. The case is in very good condition. The dial has a beautiful patina but is missing lume at the 3,4 and 8 plots. The hands are O'K and what you see with a ~50 year old speedy. The crown looks to be original, and I imagine that the pushers are too (I can never tell about the pushers). When you get it serviced it may need a new crown, pushers and crystal. These items all have seals that you cannot replace. For the inside of the watch to maintain its' integrity these seals need to function. In any event, you should get back any original parts that have been replaced.
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