Stewart Warner Green Line Gauges

[BBIGG BLOCK 396]

I have a good friend that just bought a factory big block 66 Elcamino with 4 speed.Really nice little truck and as I was looking I noticed it has a set of the old greenline gauges in it.They all work great.I asked my friend if he wants to sell them and he said that he would and to make him an offer.The gauges look really good but the 3 panel holder needs restored due to someone painting it .My question is this guy is a friend and I do not want to short change him but then again I do not want to pay too much.What would be a good fair offer for this set of gauges.

Thanks

Bobby Dodson