Frank,
that is pretty cool. Heat up in the sun and then go cool off in the rain.
Thanks for the info. I was able to locate one auction and I think the list price is rather low. An SGC 20 sold for 3500 at hunt auctions in 2008. Not sure if the market has declined since then. I also found a SGC 70 that sold at Mastro for 9600 in early 2009 but I take their auctions with a grain of salt.
http://huntauctions.com/LIVE/imagevi...1106&lot_qual=