Shailesh Chavda has a beautiful collection of matchbox labels up on Flickr. I have a book of Czech labels but I’ve never seen these German ones. Dave from Grain Edit originally turned me on to matchbox labels when he showed me his collection (I think they were mostly Czech). They’re so incredibly detailed considering the format; most of these would do fine as posters. I think the most striking part to me is the printing, when blown up you can really see that nice grain and spacing in the ink.
Many more great examples can be found here