Hello:
Erfurt did not make holsters nor did they stamp them with a crown. The mark you refer to should have a Roman numeral I, II or III under it. I believe that they are the acceptance stamps for the 3 Bavarian Army Corps. Constanzo, World of Lugers, states that the stamps are Weimer Police asseptance stamps, however, that is not correct.
Look inside the flap or on the front of the holster under the flap. You should, but not always, find date and maker's stamp.
Good Luck,
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