I picked up this 935 style wing at a local swap meet recently. It is from the collection of David Glenn, and I bought it from a friend of his. Hagerty is selling David's amazing collection of Porsche cars and parts soon. I have no financial interest just passing it along. David's friend was not sure where he got this wing, but David worked for a whos who of Porsche shops including Ruf, Kramer, PCNA, Brumos, etc.
My initial searching has not turned up anything about it. I will start to dig deeper in old books and magazines.
It has a cable adjustable blade in the wing, that presumably the driver could adjust during a race. It says "Trim-Line" on it and has some German language stickers.
It looks like it will bolt right up to my 930...
John