oldest German letter scale

This is one of the first German upper-scale letter scales. This scale model can be found in catalogs of various scale suppliers. That is why I cannot tell who the actual maker of this copy is. The letter scale is attributed to Gottlieb Kern & Sohn. This company started in 1844 in Onstmettingen in Württemberg and later moved to Ebingen also in Württemberg. The letter scale has a very low auxiliary lever pivot. The frame is made of cast iron. The measuring scale is made of brass. The first copies of this letter scale model were sold by Gottl. Kern & Sohn on June 28, 1851, these scales were in the Kern catalogs until the late 1930s. To celebrate the 150th anniversary, a few different replica versions were made in 1994. The similarity of these so-called replicas with the original scales is only approximate. There were two replica models with a flat plateau, weighing up to 100 grams and up to 250 grams respectively, see this replica. And also two replica models with a saucer-shaped scale for weighing for example small items, also weighing up to 100 grams and up to 250 grams respectively.
The height of the letter scale shown here is 19.4 cm. The diameter of the saucer-shaped letter tray is 6.5 cm. The weighing range is 100 grams. The scale is subdivided per 5 grams, between 10 and 20 there are stripes per gram. The 15 grams is marked separately on the scale in GR. A slightly different version was shown earlier, see here, there the unit of measure is abbreviated as G. The frame of the specimen shown here ends at an acute angle on the left, the end of the frame of the scale shown earlier is rounded, the drawings at the bottom of this page also show this difference.
Below are some more images of this old letter scale from Germany.