didn't think I'd ever see a question like that posted by you in the past .
I'd say you have the name right (first name probably Rudolf or Rudolph).
While I can't help you with the maker, I can at least show you where the store used to be.
Looks like Allied bombers helped to "restructure" the old Cologne architecture there as well.
Well gents, I guess you are 100% correct with Beutelstahl. There are several Beutelstahl's in the Cologne area and there is no entry for Besselstahl in the entire www.
Beutelstahl was a maker of medals and awards and probably just a distributor for this visor.
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