Textbook Luftwaffe M43 cap in blue wool. 1944 dated example with factory applied insignia, a hand sewn eagle and a machine stitched national cocarde placed over the eagle. Blue silk intererior with RBNr. maker mark (0/0501/0015) and size marking 58. The cap shows light use and just looks perfect in all ways.
You can see it’s twin brother here: https://sandeboetiek.com/product/textbook-luftwaffe-m43-cap-einheitfeldmutze-1944/