We recently picked up this super example of the black twill side cap as worn by Luftwaffe ground crew and mechanic personnel.   This cap retains a rich, dark color with minimal fading and a firmly attached Adler.  This specimen is a bit nicer than most others because it is an earlier example, being 1939 dated.  The interior tag is what really sets this cap apart from most others currently found for sale.  The interior contains a separately applied maker tag for the Heinrich Ohlig firm.  It is sized 57 and again, dated 1939.  To top it all off, the original owner has also penned his name to the tag.