Rare Auto ALPA 1.8/55 made by ASHAI KOGAKU (Pentax)
Asahi Kogaku made Auto Alpas are relatively scarce. They were
meant for the quality substitute for Kern, Angénieux and
other lenses and sold with Autobags fixed.
This 55/1.8 lens is a SMC Takmar 55/1.8 in disguise and the serial
number starts from 185501 or 185511. The production must have
been very low. It is doubtful if other Auto Alpas were ever made