Maybe the movement inside came from an original RAF watch and its been recased/redialed by your relative when it was decommissioned. If you get the serial number from the movement you could always get an extract from the omega archives and if it was supplied to the RAF it should say. I think the serial number should be somewhere in the 9 millions if i remember correctly so if you open it up and check that might suggest if going down that route is worthwhile.
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