There is now a new Wikidata property for Carthalia pages:

https://www.wikidata.org/wiki/Property:P5652

It's fun to play around with the possibilities of Wikidata. Here's a world map of theatres on Carthalia:

https://tinyurl.com/ya9x4n6n

It will not be complete before I haven't entered all theatres with postcards in my collection into Wikidata - however, there are already around 1.900 items there that feature the Carthalia ID. Furthermore, not all Wikidata items on theatres have geographical coordinates. I will try to add those, too.

Carthalia featured in The Collector's Weekly Hall of Fame:

http://www.collectorsweekly.com/hall-of-fame/view/carthalia

Thanks to Marty Weil for featuring Carthalia on his Epehemera blog.

Link: http://ephemera.typepad.com

The Ravensburg postcard I'm talking about is this one: