Rockin WR,
Good going, now we are getting somewhere. Instead of Mulheimern it very well may be "Mulheim RH" which perhaps is Mulheim Ruhr Hessen (Mulheim is in the state of Hesse on the Ruhr river). I still think the name is probably Rudolph (or Rudolf) Guilleaume.
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If it's made after 1918...it's a reproduction
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