I won that auction, by the way--and the trombone plays quite nicely, though the slide needs more work than I anticipated (though its not beyond hope). It has a 7" bell and a dual bore of about .490"/508". I assumed it was a Selmer (Paris) Bolero as well, though it looks nothing like the other Selmer Boleros I've seen:
http://www.horn-u-copia.net/instruments/Selmer/Selmer-Trombone-8046.jpg
Here's some other things that don't seem to add up--Selmer supposedly introduced the Bolero model in 1962 (according to their website), but has some rather "archaic" features:
- It's friction-fit with no connecting nut
- There is no slide lock
- There is no serial number ANYWHERE.
Euphanasia makes an interesting point that it does share some common characteristics with an Olds Standard--which makes sense since that model was in production at a time when their horns were friction-fit and had no slide locks, but Olds definitely had serial numbers since 1912. Also, I've never seen an Olds with an S-bend in the bell piping.
Perhaps JohnL might know something about this model? Was it a special production model made by Olds, or a prototype for a line that was never put into full production?
In the meantime, I'm going to ask Jay Friedman if he knows anything more about his "Bolero" trombone.