Georg Roth's company in Austria presided over a wonderful variety of interesting handgun development, and this is one example of that lineage. Roth's licensed or purchased the patent for this pistol from its inventor, Wasa Theodorovic, and turned it over to his engineer Karel Krnka to develop (I'm simplifying this). The design used a long recoil action and a rotating bolt, elements which would later find their way into the designs of Rudolf Frommer, who worked at FEG where the Roth pistols were manufactured.
About 80 of these Roth-Theodorovic-Krnka pistols were made, with no two quite the same. They were in a constant process of development and improvement, and this (serial number 77) is one of the very last ones. It exhibits a quite refined fire control system with single and double action modes as well as a decocker. It is made yet more interesting by the addition of a grip safety, which does not appear to be a factory element. Instead, it appears to be a design patented by Tambour and installed by a contemporary gunsmith. Tambour safeties were put in a number of other types of guns at the time, including Mannlicher 1901/1905 pistols.
Frommer 1901: https://www.full30.com/video/ff3a8d6c36527add95e631db71fa78ca
Roth-Theodorovic-Krnka 1895: https://www.full30.com/video/2b525eb0f8f0dd345ee502cf79a3c935
Roth-Steyr M1907: https://www.full30.com/video/33cb70a6ffe83bbf20e02d0c28201105
Roth-Steyr M1907 Slow Motion: https://www.full30.com/video/97ee38f20c46cda4fc506535ecc3bc58
Roth-Steyr M1907 Shooting Match: https://www.full30.com/video/a58130308e49743f931696c692b6608f
C&Rsenal on the M1907 Roth-Steyr: https://www.full30.com/video/3ef4775e5fdbcfe7adb2fe7d8ec22154