Lipsia 11R
The Lipsia 11R is identical to the Lisia 11, except for the "R" button which can be used for backtransfer of the result into the setting register, by slightly shifting the carriage, to give the gears in the carriage purchase on the (permanent) gears on every setting wheel. The gears int eh carriage turn a number of teeth commensurate with the number they were displaying before the clearing operation started, so this works actually quite fine. This machine is much cleaner than my Lisia 11R, and in addition, it came with the original manual.
This manual not only describes the range of Lipsia calculators, but also explains what the "extra" comma slider bar which displays E(iner), Z(ehner), H(underter), (or in English TM, M, HTh, TTh, Th, H, T, U, 1 2 3) ... is actually for (and coming to think of it, it is not so stupid at all).
The idea is that as soon as you start setting the first number in the setting register for a series of similar calculations, you decide where the comma will be, and thus the number of decimals. You then shift the bar so that the "E" for "Einer", or U(nits) is over the first column to the left of the decimal point. From now on you can easily see which column are tens, hundreds, thousands, tenthousands ..., so even for large numbers you can start setting them into the correct column as you would read them naturally, from left to right, instead of having to start with the decimal point and work your way upwards. This allegedly makes setting quicker. And I imagine it would indeed.
The serial number is stamped at the rear rigth corner of the baseplate of the machine, and cannot be seen without taking the rear cover off. This finally led to the solution to finding the serial number for the Lispia 8H as well - it is in the same location, but I never cleaned off the dust, and missed it completely.
Now some pictures of the 11R:
