#1. "RE: very early "nicca" ser#41025" | In response to Reply # 0Luke_Miller Nikonian since 19th Apr 2006Fri 09-Dec-11 11:52 AM
Here is a link that shows the various Nicca models.
I had a IIIS for some time. The Niccas were patterned after the Leicas of that era and the Nikkor lens is a Leica thread mount. It will work fine on thread mount Leicas or M series Leicas with the thread mount adaptor. I used the Nikkor 50mm f2 that came with my Nicca on my Leica M4.
Nicca was supposedly established by former Canon employees and eventually became Yashica.