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I'm looking for a custom gig bag maker for my 1917 Helicon. Any ideas?

Try this:
http://www.schneideruwe.de/helikon.html

Donna Altieri and company made a custom bag for my big Bb helicon in 2001 and it has held up great since. The bag has doubled over the years as a bell front tuba gig bag, too, although it was a snug fit. Mine came with a shoulder strap and bell cinch cover. http://www.altieribags.com" target="_blank

+1 for Altieri, that where I got mine