The Minolta 16 II was a so-called "fixed-focus" camera, with the focus set to about 9 feet (meant to focus with adequate sharpness from 3.5 feet to infinity at f/16). With the close-up lens, you can focus at closer distances. This slides over the lens. The close-up lens attachments allowed spies to secretly snap photos of top secret documents, blueprints, etc. during the Cold War.  

For Your consideration is a nice example of this camera.

I ship world wide with Canada post, insured and with tracking

I will gladly combine orders as I am selling a few Items from my collection now.

Minolta 16 refers to a line of 16mm subminiature cameras made by Minolta between 1955 and 1974. The negative size was 10x14 mm for the earlier models, later, a larger format, 12x17 mm was adopted, using single-perforated 16 mm film. It was possible to load your own cassettes, and also develop the film using a special developing tank with a spiral insert for 16 mm film.

The Minolta 16 can be traced back to the Mica Automat built by Konan in 1947. Minolta bought out Konan in the early 1950s and continued producing cameras under the Konan name for several years. The first camera labeled Minolta 16 rather than Konan 16 was the Minolta 16 Automat of 1955. The Minolta 16 used a newly designed film cassette which was not compatible with the Konan models.