After checking VeloBase, I don't think Dura Ace 8 speed freewheels were made. I think the first 8 speed was a cassette, CS-7400-8 after the 7 speed cassette offering. You might want to check it again.
Pics would be nice and yes they have value, check the bay. I see you have a Montello as I do. Though I wish mine was all Campy, it is all DA 8 speed with the exception of the HS, post and pedals.
Well I can provide a pic and you can tell us if it looks like this:
[IMG]
P1020187, on Flickr[/IMG]
BTW, I prefer Campy too, but this hub and this DA system is arguably equal too or better than the equivalent Campy performance. My Pin has DT shifters which suit me fine given the cost of brifters and the improved cabling aesthetics.