I found more 2.1cm f/4 photos after a dive into the archive. It was the widest lens at my disposal until I got the first of the 15mm f/3.5 Nikkors, and since exact framing wasn't possible, my pre-perception of the rendering increased. A very valuable lesson for a budding photographer.
The near limit of 0.9m, typical for rangefinder lenses at the time, was overcome using a close-up lens. If memory serves this was the 3T Nikon achromat.
Both images with Nikon S3.