I spotted this on Youtube recently and so I ordered myself a copy off Amazon. It arrived today and from what I've seen of it so far by flicking through it, for what it is, it looks ok, for the price.
REVIEW,THE ARMOURER SPECIAL EDITION,A GUIDE TO COLLECTING GERMAN MILITARIA - YouTube
A Guide to Collecting German Militaria: Amazon.co.uk: 9781910525104: Books