Vallue on a full set of Cup 2 wheels

[redstack]

I have a set of 17/7 and 17/9 Cup 2 wheels. A friend wants to buy them but I'm not sure if they are knock offs or maybe authentic Porsche wheels. ?
Of course the photos are much clearer on my laptop. I can say they are 17" 7&9 ET55 on all. The manufacture date appears to be 96 on all. They sport the triangle stamp which indicates what, fuch or build?

[Ralph3.]

Look OEM to me, $700 to $800 would be my price. Had a set on my 964 for a while though they had been plated. Paid $595 for them