Butchie,
This is a delightful book, and as you have found, it is indeed rare. It was originally designed as a simple set of answers to common topics and questions, and so is not of great import, philatelically, but is still a lovely gem.
The German National Library has a copy, and they have actually digitised it so everyone can read it. Well it is in German, and printed in a Fraktur font, so I am perhaps overdoing it with "everyone", especially as I can't read German!
The digitised copy is at this link:
https://portal.dnb.de/bookviewer/vi.../n0/mode/1upThe APRL does not have a copy, so if you don't want to retain it, post it to them. I am sure they would be really happy to receive it.
You can see by the title page, which I have reproduced here, that the author is the famous German philatelist Max Ton. The book was published in 1920.
Thank you very much for drawing this to everyone's attention.
