Description: Another work by our Fritz Neumann, look at the signature and the stamp mark on the third picture.
Notes: Taken from eBay Kleinanzeigen
Short description: A tile with a print called “Am Wind” made by Rosenthal
Notes: Found on lauritz.com . There are many other examples available on the net (Google Image Search ). According to this page , the mark shown had been used by Rosenthal between 1939 and 1956. Another hint from this page is confirming this by the used style of the underline.
Update: Rosenthal answered my inquiry

A signature of Fitz Neumann (1881 - 1919), taken from findartinfo.com . His subjects are mostly Cossacks, he was a painter.
Additional photos from different sources (like eBay and Google Image Search) have been added, the “About” section has been updated. Links to external sites (except eBay) had been added to the Wayback Machine .
The next steps are the different known traces like the stamp mark and the different Fritz Neumanns.
Short description: Sailing Boats
Notes: Sold originaly in Bremerhaven, see label. The shop still seem to exist.
Short description Alley with three lamps
Notes: The name of the images is “Drei Lampen Gasse, Paris” (Three latern alley, Paris). One of only a few named prints currently known.
Short description: Sailing boat next to a harbour / slip
Notes: Found on eBay