From 1903 to 1919, a bicycle manufacturer in Vienna, Austria, known as A. Greger and Company produced the Courier, a rebranded Oliver No. 3. Production ended in 1919, but machines were still being assembled by 1924, and sold until 1927. The same machine was also produced as the Jacobi for a German office equipment dealer in Munich. The name "Jacobi" was taken from A. Greger and Company's sewing machine division. The other variation of the Courier is the Jwic, which was produced for the Czech market.
At some point, A. Greger and Company updated their rebranded Oliver machines. The traditional olive green paint was discontinued in favor of black paint. The logo on the paper table for the Courier changed from displaying "Courier" to "The Courier Typewriter", as seen below. The ribbon reverse was changed to the style introduced on Oliver No. 5 machines. A backspacer was also added to when it was introduced on the Oliver No. 5.
The serial numbers for the Courier, Jacobi, and Jwic are intermixed. Note that the majority of these machines are Courier typewriters. I know of only two Jacobi machines and one Jwic in existence.