Vintage Besson & Co. antique brass and copper military style bugle

Description

This is a nice older bugle by Besson & Co..  It appears to be made of brass and copper and is well marked with:
Besson & Co.
London W.C. 2
H75983
There is also a stamp above the "Besson & Co" but I can't make out what it is.
The bugle measures 11.25 inches long.  The bugle is in good vintage/antique condition though I can't claim to know much about bugles.  The bugle has not been cleaned recently and the chain is attached only at one side.