any ideas on this one?
1. There should be a number in the upper left corner (R180 for Dieckmann card)
2. The font should be a bit more delicate.
You can compare if you have other Hoffmann cards.
I like this one: https://germanpostalhistory.com/php/...arch&#itempic1
Thanks for the link to the postal history site. There is some great reference material there!