This instrument is a Besson International with a tuning slide extension that can be removed to place the instrument into the key of C.
It has extensive engraving "Besson International" on the front of the bell, and the usual engraving with model and manufacturer has been placed on the underside of the bell.
This trumpet has been fully restored. Serial number is 127xxx.
The engraving on the underside of the bell reads:
"50 MEDALS OF HONOUR Besson & Co London. British Throughout Agents Chas Begg & Co Ltd New Zealand"
Record suggest this instrument was manufactured around around 1933.