I doubt that the Omega archive does have any information what engraving the watches got from the MoD.
Have you ever seen an extract that states the MoD issue number? If Omega would had got a feedback from the MoD -or even made the engraving itself prior delivery what some people think- they should know the issue number, don't you think? But not a single extract from the archives exist with that information. As I said before in several other threads, it is more likely just an educated guess from Omega. ALL SM300 sold to the MoD in 1967 went to the Army, hence the engraving must be W10, and ALL SM300 sold to the MoD from 1968 to 1970 went to the Royal Navy, hence the engraving must be 0552. It is as simple as that. No rocket science for the museum staff.
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