I agree with
@STANDY . I wonder if Omega were any where near as concerned about the stamp on the inside of the case back, as we are.
They didn't provide me with much detail regarding the watch case in the Extract of the Archives. It just states that it's made of steel and that it's an ST105.012. Nothing about who made the case. In contrast, the information provided, regarding the movement, is very clear.
The previous 3 years of this reference all had double step HF case backs. Maybe, as long as the case backs on the bench for the 66 run had a single step and were stamped 105.012-66, they just screwed them on??? They both fit, so maybe they were not too bothered if it had a CB or an HF stamp??? 50 plus years later, It's difficult to know for sure.
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