Issued by AG für Schriftgießerei u. Maschinenbau in 1900. [Reichardt] Also carried by Van Loey-Nouri as Grotesques [c1914 specimen]
Adopted by Photo-Lettering and shown as Xenotype 3471 in AT Vol. 2. Listed as Neptun with Open, Contour, and Shaded variants in the One Line catalog (1971). Also offered by Letraset, and by Face Photosetting as Neptune in regular, Rimmed, and Outline styles.
Digitized by Peter Wiegel as Neptune CAT (2014).