I've got a postcard sent by the squad from Germany with all their autographs on. I'd scan and post it if I could work it out !
Hard to imagine now but there was a special 1st day issue envelope/postcard with "Fußballspiel Aston Villa F.C. -Deutsche Nationalmannschaft 15.5.1938" postal stamps
Don't let spk and our other enlightened friends over in off topic know about the man shafting. Though being a man shafter to a national standard does actually sound pretty impressive.