http://search.ebay.com/261072274629 Ending in 9 hours. Very low price for the set. Condition unknown. I think $200 - $300 is good buying price for this set, and submit the coin to NCS/NGC. 1980 1 yuan is currently selling very well inside China, not ebay. There are 2 varieties with 1980 yuan. Take a look at th MS66 1980 yuan (common variety), sold for RMB 1200 or about USD 188. http://www.coin001.cn/read.php?tid=16105 The 1980 yuan is selling poorly on ebay. This is the scarcer variety and also a very nice example. http://search.ebay.com/160835977297
Here the seller sell other diferent 1980 set http://www.ebay.com/itm/ws/eBayISAP...%2BicPEA%3D&orig_cvip=true&rt=nc#ht_500wt_922 For 664 uss.
Thanks Thor. These early China mint set were for export market, but were heading back to China now. $664 is strong price for the blue cover of the 1980 set. Black cover is slightly scarcer.