oftheherd
Veteran
Ok. That makes sense. Still, a pretty well made and quirky example of an M42. After my original post earlier I googled and found an old print ad for the AZ-1 that touted it to be the first to be sold with a kit zoom! A dubious distinction.
That was the 43mm - 75mm lens. Not a bad lens really. The concept apparently wasn't too bad. Others copied the idea, including Nikon. I don't recall who else did. It was touted as a very useful set of focal lengths in the photo magazines. Zooms not of course cover more.