Horn from 1967 Honda CB160.  I believe this also fits all of the 1960's Honda CB/CL160's and 175's.  This was taken from a barn find complete bike (with damaged engine case and the wiring a mess). 

Tests fine with a clear, even, loud, unbroken tone.

Cosmetically ugly.  I think this was originally silver, but was painted black, which is now chipping off.  I detected a slight dent in the dome (see photo #6) - You can't really see it, but you can feel it. This horn definitely warrants a repaint. 

The electrical leads are 3 to 4" long and do not have connectors at the ends (just exposed wire).  The remaining insulation is sound with no cracking or open areas, still flexible.  The seal where the wiring penetrates the horn body is dried out and hard.  

Mounting bracket attached properly and undamaged.  Like the horn, it could use fresh paint.