I was a little quick off the mark. I just spotted that Kuduae had sent me a message reading, in part:

"That directory has just one gunsmith, Josef Pramesberger in Bad Goisern, mentioned in 1955.Though Pramesberger is a frequent name in that area, there is no gunshop Pramesberger in Bad Goisern any more".

Perhaps known to some of the forum? I'm also following up with a possible relation, also a master-gunsmith, of the same surname.