Great time to read a little.
I just finished this one by A.J Nathanson and thoroughly enjoyed it. Only 50 odd pages (many with photographs) so a quick read. A fair bit of repetition from Graig's "The Mint" but some interesting additional background information on Simon.
Interestingly, I noticed that the photographs were taken by Frank Purvey who wrote one of the best little intro books for the fledgling collector. I still have mine which I read as a boy and recommend it to anyone starting off.