Gerben, et al. - on the parallel thread on Jan Still's site, Klaus Merzbach provides an excellent list of Reichsbahndirektionen as of 1927. One of them is Elberfeld which in 1929-30 was consolidated with its neighbor Barmen and renamed Wuppertal. If the holster was stamped in 1930 or later, the marking could be from the Wuppertal Directorate located in Barmen.
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