What kind of lens is this Steinheil in Munchen?

Steinheil in Munchen N°34250 Patent

Diameter of the front lens 62 mm.

Diameter of the rear lens unknown.

Length of the lens with the hood 85 mm.

Attachment 197405Attachment 197406Attachment 197404

Images used with the author permission.

It looks like it has nonstandard f-stop nomination from 1/2 to 16.

Steinheil has traditionally most data on the (lost?) flange.

After his co-discovery of the Aplanat/RR with Dallmeyer (1866?), Steinheil developed a lot of similar lenses which had rather thick glass. Only an expert, of which I am not, can tell them apart!

One of his oddities was to label with the effective diameter in mm.

Quote:

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Originally Posted by Steven Tribe

Steinheil has traditionally most data on the (lost?) flange.

After his co-discovery of the Aplanat/RR with Dallmeyer (1866?), Steinheil developed a lot of similar lenses which had rather thick glass. Only an expert, of which I am not, can tell them apart!

One of his oddities was to label with the effective diameter in mm.

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The curious thing about this lens is that I thought that it is a common Aplanat or RR but it fetched fairly high price ~€600 so the buyer must have known something about this lens.

How should I interpret this non-standard aperture scale?