Those butterfly pull through are darn rare, never seen one for sale, though a few collectors own one (not me unfortunately); in an old KCN article (1993 by Hank Wichmann) he describes the pull through variations, and this one is the earliest in his outline.
His butterfly pull through was found in a "KH/1935" can, and the butterfly pull through marked "G.Appel 1935"
On a side note, Hank also mentioned the possibility of Steyr's facility at Graz making cleaning accessories (a tool marked e/815 & bnz/2 shield), though MarkW later query him on the possibility of a MG connection regarding the tools. Normally, I would discount the Steyr Graz observation and attribute Mark's comments as the most likely. However BerndN, another very resourceful German collector, in his MRJ article on the RG34, also mentioned seeing a can marked "kur" and their waffenamt e/815.
Very possibly a MG cleaning kit connection, but as I have seen pictures of your collection, I just have to ask, have you any thoughts on the Steyr Graz (kur) RG34?
