And here it is with postcards in it. It holds 20 cards - there a few gaps and already it's bulging.
EDITED: They were stored in a box which meant they were rarely seen. Of course I'll need to do another or something similar to accomodate the cards I've been receiving lately from another exchange. I've been contemplating something concertina fashion that could be hung or displayed on a shelf but that one needs a bit more planning