Ser no 505768 (feel free to confirm date)
Finish no 23 (which was a very heavy lacquer that started in the 30's - thick enough it makes making out bell engravings tricky unless you have the right angle light - details available on various Conn sites online).
The horn has some expected surface wear for its age, so not a mint example by any means, and was played regularly at the time. Plays fine, but I haven't had it serviced recently.
It comes with the Original Case plus the original Conn hang tag and warranty card. Case has plenty of wear, as you can see, but it's original! You'll need to provide a mouthpiece, as I don't have the original.
Selling for 200.00, which is well below what I have seen even later models sell for. If you're into period horns from the 50's, this is a great chance.