This one has the original hands and dial of a CK 2292 (the famous model sold to the RAF during WWII). It could either be one military watch, recased and resold by the Ministry of Defense as they did for a batch, or a civilian one. If you wish to know more precisely its provenance, you can order an extract from Omega museum. Anyway an interesting Watch for collecting.
The military CK2292 had a light alloy case that was brittle, so recasing in steel case was probably a way to improve its solidity for civilian markets.
Here is a picture of my CK2292 (military issued with its original HS8 marking) :
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