.500 3" Express by H. Utendoerffer

This is probably general knowledge but it’s way out of my field. I have a .500 3" Express with an “H. Utendoerffer D” headstamp. What does the “D” stand for?

Paul

According to Brad Dixon in his two volume work on European Sporting Cartridges, the German companies used the English 360, 450, and 500 BPE rounds as a basis for some of their sporting cartridges. The German versions had a more tapered case near the rim and a slightly smaller base (14.55mm versus 14.65mm).

Utendoerffer used a “D” (for Deusche) on their h/s to indicate the German version and a “E” (for English or less likely Eley) for the English version.