Found this at a local thrift store recently. The Minolta SRT101 was a mechanical SLR originally introduced in 1966. It spawned several later models and offshoots, but this one is a classic. Mechanically operated- requiring no batteries to shoot- it has a max shutter speed of 1/1000 and is capable of both mirror lock-up and self-timing. A distinguishing selling point of the SRT101, however, was advanced light metering system is used. Designated 'CLC' and seen above the lens mount, the system used two sensors to meter and adjust between both the top and bottom halves of the frame. Additionally, it took into the full range of exposure settings, including aperture. This combination of mechanical and electronic systems gave the system both advanced selling potential at the time and decades of longevity.
The SRT101 was originally offered with the 58mm F1.4 seen here, though as time went on, two additional kit lenses were offered. All were fast 50mm lenses, from the era of the 'standard' kit lens. The focal length of 58mm was apparently a consequence of Minolta lens design at the time; for an F1.4 lens to clear the mirror it had to be 58mm. Their later offerings were still slightly longer than normal, with a 55mm F1.7 and 58mm F1.2 being offered as the 60s went on.
In my case, the self timer on the front was busted, causing internal difficulty and preventing the shutter from working. Because of this I haggled down the price and go them to throw in an extra zebra-print strap.
A great find for the lens alone!