Hi Felix,
Check out Alan Rouse's excellent website called "Olds Central." On this site the Olds lover can drool over lots of cool Olds information!
Here's a real page from the 1932 Olds catalogue that talks about the Olds Military Model Cornet. Hand hammered bells were an option back then . . . unlike today, although most Olds horns of the time were not purchased with this unique-looking option! The Military Model of '32 had a hand-hammered bell and this unique look can be viewed in the link below.
Alan estimates, on his site, that Olds trumpets (and presumably also cornets) in the 4000 range were probably made in either 1931 or '32.
http://rouses.net/trumpet/olds32/olds_30s_13.htm
Bookmark Alan's site! You'll visit it many times!!!
Sincerely,
Tom
PS: Here's a photo of Alan, taken by myself at a cornet collector's annual meeting a few years ago. Alan is a great guy in person too!
BTW, Alan is testing a pristine, super-rare King Mini Liberty Trumpet in this photo. This model was never sold to the public and only offered as gifts by H.N. White to friends, artists and other very special people! This horn plays just like a piccolo trumpet in Bb . . . only it LOOKS much cooler!
