What kind of lens is this Steinheil in Munchen?

[erian]

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.

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Images used with the author permission.

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

[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.

[erian]

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.

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?