Based on the U punches what type is it

Torsos are cheap on Amazon. All types and sizes, with and without heads.

Lots are out there. Unless free, hold out for one that is ID' d or has artwork on it like this one I bought for $35. I use it for storage  

Souvenir hunting in a minefield can be dangerous.

all wood. the base is some ply wood, the pole is a wooden dowel held up by 4 L brackets, and the Hangar/shoulder is a 2/4 that i traced and cut in the chape of a hangar.

Hello and welcome to this Forum.

A tac marking would not be on a flap that is intended to be unseen...

That is a great addition to the Cronau story. Clearly not Reed and Barton wings but something else equally cool entirely. Looks all hand made from a sheet of silver. Thank you @KathyB

Thank you for the very detailed response.  

WWI Nerd,   That would make sense! I have a copy of the 13th's unit history and I did not even think to look there. Good eye!   On the subject of the disc, I wonder if there was ever a numbered disc made for the 213th Engineers? From what I have been finding online, the 213th was formed only when the 13th Division was in July 1918. I am having a hard time finding evidence of a fully-numbered 213th disc; perhaps this might explain why our soldier only has a plain "13" disc?   I also found a 213th Engineer Regiment history online:   https://babel.hathitrust.org/cgi/pt?id=nyp.33433000144091&seq=63   Had a hunch this would prove to be an interesting research topic!   Best Regards, -J.D.