The Oliver Monopol-Stolzenberg and Stolzenberg machines were distributed throughout the continent of Europe by a company called "Fabric Stolzenberg" (Stolzenberg Factory). They were based in Oos Baden-Baden, a city in Baden-W¸«ärttemberg in southwestern Germany, with subsidiaries in Berlin, Hamburg, and Cologne.
Fabrik Stolzenberg began branding the Oliver No. 2 as the Oliver Monopol-Stolzenberg. This name initially carried over to the Oliver No. 3. Sometime between serial numbers 55756 and 89075, the "Monopol" was dropped and the Oliver 3 machines were branded as "Stolzenberg". Once the Oliver No. 4 was introduced 1904, Fabrik Stolzenberg sold it as the Oliver Stolzenberg No. 4.
Below are the different decals used by Fabrik Stolzenberg. (My Oliver Stolzenberg No. 4 serial number D1379 has a misleading hand-painted decal. It originally had the Stolzenberg No. 4 decal shown below.)
The serial numbers for the Oliver Monopol-Stolzenberg and Stolzenberg models are intermixed with their respective standard serial number range. Therefore, it is hard to know how many of each model were produced. I have the only Monopol-Stolzenberg No. 2 known to exist. I know of three Monopol-Stolzenberg No. 3 machines in existance. The Oliver Stolzenberg No. 3 is by far the most common Stolzenberg model; there are so many that I have lost count. In contrast, I only know of two Oliver Stolzenberg No. 4 machines in existance.