How did they make this pugio scabbard?

[Martin Moser]

From what I've read this was originally not done by etching but rather by chiseling "canals" into the underlying material mostly iron for the pugios. These would then be filled with wire/strips/plates of the metal to be inlaid. In German this kind of metal inlay work is called Tauschierung, is there a special word for it in English? See here for a simple graphical depiction: http://civis.tempus-vivit.net/sindri/Se ... erent.html

It's a little hard to make out, but I've used that technique e.g. with my reconstruction of medical needles