I think you did not get an answer because unlike luger variations, there are few collectors who have scores of luger holster, especially "certain" types of holsters; as there were scores of makers if not more.
I am sure there are certain folks who collect holsters but doubtful that there are enough folks who have variations that can say if this is a "rare" variation or not. That said, you can look up the code of DLU and know who the maker was.
My feeling is that it is rarer than say a 1941, as 1943 holsters were made towards the end of lugers being made.
But that does not make it nessacarily rare or more desirable....
Ed
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