It looks like an expert mark or owner's personal mark. I looked at a list of expert marks but could not find it. I did Google DrDub and got results but I am not sure what the results are telling me.
What country is the stamp from (Saar?). Can you provide an image of the face? Dr. Dub was (I believe German?) an expert in the early to mid 1900's. Some question some of his methods.
That mark, in that location, in that orientation, would generally mean that an expertizer has blessed the stamp and the overprint as genuine, and the stamp is not used.
This assumes the expert is using the general convention on marking. This particular expert used his own system for his work with Saar, but this example looks like it fits the system for this stamp (overprinted, unused).
Emil Dub's expertizer marks are no longer recognized for certain stamps. Also, his mark has been forged. I believe the genuine mark has tiny serifs, even on the "D".
The early BERLIN overprints are extensively forged.
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Posted 07/05/2013 09:31 am
