The 1919 semi's used to be all over Gunbroker but the supply dried up about 8 years ago.
Paid $1,100 on auction for my Ohio Ordnance Works 1919, basic gun without tripod.
Prices have really gone up.
One guy had one on GB for $3K. But it had 4 barrels in 3 different calibers, tripod with T&E, AA tripod, A6 kit, AA sight, an original wood transit box, crank fire, belts, links, and a bunch of other stuff. Kinda wish I bought that one, was for sale for quite awhile.
It's cool, real head turner.
But in reality it's a heavy boat anchor.
Heres a review, not mine.
https://www.youtube.com/watch?v=SXJZQsSUCfQ