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I purchased this lens for $5 at a thrift store. It's fully functional and the glass seems in good condition, however, I cannot identify the mount or the lens (the front name ring is missing).
When I searched F=1.9 and 50mm, all I found online was a Chinon lens with a Pentax K mount. This is not a K mount, as I cannot mount it on my Pentax bodies and adapters. I couldn't mount it on Canon A-1 or on Minolta MD mount either.
Your lens is a Yashica ML 50mm f/1.9. The one pictured below is a more recent version of the same lens.
The mount is the CONTAX/Yashica mount. Yashica revived the Contax name over a decade after production of any Contax rangefinder cameras and lenses in Germany had ended. Yashica chose to officially market the line as 'CONTAX' (always in all capital letters).
The C/Y mount, newly designed by Zeiss for Yashica in 1975, has a registration (flange focal) distance of 45.5mm. This means it is fairly easily adaptable for use on modern cameras with a shorter registration distance, such as the Canon EF, Minolta/Sony A-mount, Sigma SA, Canon FL/FD, Four-Thirds, M39, Leica M, and most all popular mirrorless camera mounts (µ4/3, Sony E, Fuji X, EF-M, Nikon 1, etc).
