Scale, letter scale, pendulum scale with movable scale, postage rates in Germany and protected areas, Universal Postal Union

In February 1881, S. Horn from Offenbach and M. J. Albracht from Amsterdam patented the "Innovations in Letter Scales." The innovations were that on the scales, not only was the weight in grams given, but the postal charge for letters, printed matter, samples, and business papers according to the tariff of the Universal Postal Union were also shown. In addition to this, the centric alignment of the scale’s stand, which consequently required a level connection between the load-bearing pendulum level and pointer, were also new.