Rare zipper modified issue turtleneck sweater

Rare zipper modified worn issue turtleneck sweater in used condition. Interesting example which was dyed blue and had a zipper added to the collar. The sweater was probably dyed for Luftwaffe or Kriegsmarine use. There are repairs and paint stains but the collar is very displayable on a mannequin, perfect for under a smock or other uniform. Very hard to find.