I have a Besson 967 Sovereign Euphonium which has some markings and engravings on it which I cannot fathom. I would be interested to hear if anyone knows what they are. The instrument dates from 1990 and the serial number is 786***. The markins are 'M' or "H" stamped into the ring that joins the bottom bow to the bell flare; "MM" or "HH" stamped vertically on the opposite side, joining the bottom bow to the main branch. There are also various numbers scratched on the slides: Tuning slide - looks like 706 1st slide - 105 or 108 4th slide - 700 I have *******ised the instrument a fair bit (Imperial buttons and Regent valve caps) but the parts with the numbers and engravings are original as far as I can tell.