I can't recall seeing split stems like this, however Omega does supply one piece stems that are not trimmed for a number of their watches, like this one:
Of course these are specific to the case number, because any change in size of the case means this stem would no longer work. The same would be true with a split stem of a fixed length as you are suggesting this one is. It may be the correct crown for that case number, but that crown could have been used on a number of cases, since that is often done. If this specific part came off another case that is of a different diameter, it won't fit this case if what you are saying is true.
Typically the female split stems that I have seen are very much like a normal stem that has to be trimmed to the correct length - that is the style of stem I listed the part number for above. As I mentioned the male end that is in the movement is a fixed length, and the female portion is the one that can be altered to fit.
Cheers, Al
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