We know lots more about the Donihoo scabbard now than when the research for Holstory the Book began in late 2016. Looks like I created not one but two blog posts about him (see above). The point of all of it is how the Donihoo was constructed to keep it strapless and that this understanding was generally disregarded and replaced by a strap -- because makers other than Jack Donihoo (an LEO yes but also made his holster, in horsehide) didn't understand how the welt stack's assembly contrasted with the Threepersons' for revolvers.
Below is a 'fun one' because the maker's mark on this particular Donihoo scabbard is by a maker that sold out in the late 19th century to none other than Sam Myres (not known as 'Tio' until WWII). We know that the stamp itself is currently in a Texas museum so this one was made by someone in possession of it then while the various players at Myres Saddlery Co's demise sorted out what marks they were going to use in the late '70s.
Fear not, this holster does not preceed the Donihoo of the 1950s. The list of makers in the '60s who added the Donihoo to their range reads like a Who's Who of the gunleather industry and included the biggest -- Bianchi and Safariland -- and the smallest -- Seventrees and small saddleries of TX. JB claimed it.
Read more about the Donihoo's place in holstory in my book titled "Holstory -- Gunleather of the Twentieth Century -- the Second Edition" available at www.holstory.com .
The very large difference in how the welt stack of a Donihoo functioned vs a Threepersons, with both pieces of information lost to holstory until my research began in 2016: