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Engraved Self-Balancing
This horn is a fairly average Self-Balancing from the mid-1930's (slide s/n M71xx; the bell is only marked LM); .495"/.510" bore with a 7" bell. It does have some very nice engraving on it, though. Although the slide and bell fit together just fine, they don't seem to quite "match" from an aesthetic standpoint, so I think this might be a parts horn.

Overall view
Bell Engraving

The Bear
Back Side View