German props from WW1 are comparatively rare.  In good original condition they are even rarer.  This example dates from c1917 and was made for the Mercedes 160hp engine.  It is not possible to ascribe this prop to a particular type of aircraft but this combination of engine and prop was widely used on C Type aircraft such as the AEG C II and Albatros C III.

Propulsor is the trade mark of the Deutsche Luftschraubenbau at 2 Reuterplatz, Berlin-Neukölln.  They made comparatively few props.