Pentax introduced the MG in 1981, as the successor to the MV1 and in the line of simpler, automated, bodies going back through MV and ME of 1977.
The MG is aperture priority automatic, with no manual shutter speed other than the flash sync of 1/100th second. The metal focal plane shutter is electronically controlled – by and large photographers had overcome their initial hesitation about trusting electronics, and the increased accuracy and reliability of such a shutter was now well accepted.
Shutter speed is shown in the viewfinder, but the selected aperture is not. There’s a simple clockwork self-timer, and the hot shoe features an additional electrical contact for use with a dedicated Pentax flash unit.
Film loading is of the magic needle variety, and works well. The museum example is unique to me in that the protective film is still in place on the baseplate, and it was bought fitted with a genuine Pentax zoom – typically I find ebay cameras with some no-name zoom on them