After buying my Selmer 19A balanced trumpet the zip on the case broke. It was not easy to find a replacement case because the old Selmer is longer than most modern trumpets. Most cases are too short so I have been keeping it in a double case with vertical slots.
Then I found a case for sale that seemed like it might fit. It is made by Carol Brass case, and supplied with their balanced model trumpet. I tried my Bach Strad in it and it fitted, but the valve cut out was long enough to take the Selmer and the case itself was a bit longer. I put the Selmer in and it fitted. The end around the bell bow was not a perfect fit so I took a small hammer and reshaped the padding of the case a bit at that point. It is now a perfect fit. It has a retro look too.