Helping a friend, purchased in early 70's, can't remember if purchased directly from Stahl or from magazine. In good shape for the age, worn very little, stored in plastic bag. Does have some yellowing around collar and bottom of sleeves. He is wanting to sell it , doesn't want to mess with auction sites.
Recently, I sold a similar Champion spark plug jacket for $50. It was a medium size, large is more popular. I'd start at $75 on my table at a swap meet.