Show Us Your Stamps Depicting Stamp Collecting!

I like stamps about stamp collecting (my avatar, for example).

Here's one I got last week that I had never seen 'live' before. It is Germany DDR/GDR 91, from 1951.



In a way, it reminds me of the picture Minkus Publications used as the opening page in their albums in the '50s and '60s, but where the mother also sat in and the children were actively involved in the collecting.

Let's see any you might have.