The safety pen is with high probability a Mercedes (brand founded 1920); the characteristic script-style nib engraving, the notched feed and the somewhat larger cap-top diameter are typical features. Mercedes at first obtained its nibs from the USA, since nib production in Germany was initially mastered only by Kaweco (from 1913) and Soennecken. The four-colour pencil could be an early Fendt of Pforzheim, since Fendt developed and early patented the slide mechanism for multi-colour pencils; Montblanc also had multi-colour pencils made at Fendt up into the 1970s. The imprint 'Schloss F. Kahleis, Cöthen' could indicate a specialist dealer.