Man, that's old school. In an effort to get we guides using them, "Cowboy Jim" hunted with our camp when they introduced their speck call, and one couldn't help but think of the snake oil salesmen of old. Not that he was a bad person (gave a bazillion calls to kids), just so very much the huckster that he insisted on getting $1 for each speck call, instead of just comping them to the guides.
He and I ended at an impasse over that $1, but had some fun doing so, and I enjoyed our meeting.
Fwiw, the only time I met Dud Faulk, he gave me one of his cane "guide calls," not that I could do a whole lot with it. But I've a speck crazed friend, who's owned most, if not, every high dollar speck call out there and knows how to run them, who's gone retro and is doing most of his good with a Faulk SG-49L.
If you think I'm wrong, you might be right.