Workmate from Czech Republic has a WW2 leather Flying helmet complete with throat microphone. He got it from a Slovakian friend who flew 109s with the SlovakIan Army on the side of the Germans against the Russians. It is a German made helmet from about 1939 as later ones had some differences. He is looking to sell it and if anyone is interested PM me with your email address and I'll pass it on for him to contact you.
The Auster should be recognised for what it is: a gentleman's aerial touring carriage and a nice aeroplane.