What is suprising is not the coins or even the final auction value result but actually the packaging. From the investigation and translation that I made from coins.su http://www.coins.su/forum/viewtopic.php?t=8323, such packaging for 1980 only initially existed as hard packaging which normally don't sell any more than 30USD from what I see on ebay. (Translation can be seen here by the way: http://www.gxseries.com/numis/sovietset/sovietset.htm )
What is suprising is actually the packaging of this coin lot - it is exactly the same as the 1975 packaging, i.e. three rows instead of two. In my opinion, this sparks an interesting debate - the last mintset in such cellophane packaging last known is back in 1975 and this was restarted only in 1985 BUT back as two rows. With this mintset shown, does that mean that there were other year mintsets packed in such cellophane packaging?
Note for those who don't come to this forum often and just popping in randomly, in general it seems to be true that coins packed in hard plastic case should offer more protection and hence in theory higher retail value but due to the materials used, it ends up as mintsets in cheap cellphone plastic are more valuable especially for 1974 and 75 as survival rate of such coins are much higher but again, there are plenty of exceptions.
Got to update my site again when I get the time.
