I found the old Diastimeter telescope you can see on the pictures attached. The Diastimeter is 15 to 32 cm (extended) long and the outer tube is around 4 cm.
I am sure as experts you know that a Diastimeter is a distance measuring telescope, most of the good old times used in the military.
Usually the different models I am researching have two thin wires in the turnable mechanism and since a typical soldier from the infantry was around 6 feet high (or for the cavalry on top of a horse 12 feet high) it was kind of easy to measure the distance with a Diastimeter by bringing the two wires with the turnable ring on the same height and than read from the little scale how fare away they were, to get the settings for the canon correctly to get rid of them.
Very long story short as the first invention to this was made back in 1799 and it screws me up since years to learn more about them.
The engravings on the pictures attached say that it is a patented telescope and it has a markers mark you maybe have seen before or can identify. To me it reads like a "L" overlayed by a "C" (laying).
Do you have any idea who the manufacturer was? Or who would be a good contact for me to find out more about the manufacturer?
Many thanks in advance for a couple of minutes of your valuable time.