I was told that it was made around '86.. But when I check serial charts it's totally opposite. I find it telling me '57ish.
I've also seen some where in the 80's you add 50 to the serial prefix, but wouldn't that just give '55?.
Do the 8D's from the 50's have the mechanical trigger aposed to the strung, and the 2nd valve ringe directly solderd on aposed to the brace going around the turn of the crook?
The horn is in amazing condition if it's a '55/'57!