Frommer Prototype Semiauto Rifle
Sold for $23,000.
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Rudolf Frommer was a self-taught engineer and firearms designer who worked his way up through the FEG concern in Budapest to eventually hold the position of CEO. During this time he developed a series of long-recoil, rotating-bolt pistols culminating in the Frommer Stop, which was adopted by the Austro-Hungarian military. At some point during this time he also produced this prototype rifle, which is similarly a long-recoil rotating bolt design. I have no information on its production or performance, but I will give you as much of a look into its operation as I can.
Frommer 1910: https://www.youtube.com/watch?v=fTsVD1G1xwM
Frommer Stop Slow Motion: https://www.youtube.com/watch?v=39tX_7-mkMA
Rast & Gasser 1898: https://www.youtube.com/watch?v=m1eXG-kVlf8
Roth-Sauer Automatic Pistol: https://www.youtube.com/watch?v=6iTDPeBK0aY