World famous and designed to meet the most demanding requirements is the series of six-element COMPONON lenses, of which we have here, the COMPONON.
With the six-element, four-lens COMPONON, high contrasts and excellent reproduction of even the finest details of the negative can be achieved. The lenses designed for small formats have their greatest performance potential in a magnification range between 2 and 20 times. Designed for the 110 format, for half-frame 35mm, and for the 126 instamatic format, these short focal length lenses can also be used for sectional enlargements of 35 mm negatives.

There are the numbers 16.11.8.56.4 around the Iris Ring. These numbers seem to correspond with their 4.0/35 B-00 Iris Mount, but after looking at their specs, I'm not 100% certain which lens this is.
I have the spec sheet in PDF format, so just ask if you want to take a look at page 9 and see which lens this is.