After the introduction of the BdM achievement badges in 1934, books were distributed to BdM members to document progress. These are noted in the orders as Leistungsbuch I and II (bronze and silver). You see the Leistungsbuch I every now and again but I've yet to see a Leistungsbuch II. I'm still flummoxed by the fact that so few of the silver badges were awarded. The highest number with supporting documentation that I have found is serial number 3849 (awarded 1944). The lowest number with supporting documentation is 121. However, the next lowest is serial number 729 and that one was awarded late too (July 1943). Very odd. The Leistungsbuch II was definitely introduced and the relevant regulations show that but where are the books? If they existed then surely one example must have survived?