I'm going to call this a stencil of these Evette & Schaeffer horns. However, there is evidence I could be wrong: the right hand Bb key is missing and the horn has left-side bell keys, not split. However, the other key shapes look Buffet to me. Join the discussion about this horn on the Woodwind Forum.

There's more information about Penzel-Mueller online.

If I'm reading the P-M website correctly, these horns would have been produced between 1899 and 1920.

From tunatone on https://www.marktplaats.nl

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