augsburger - some key dates are just scarce. A lot of the earlier coins struck before 1961 were culled as they were revalued from 10 : 1. A lot of people would have sent them for exchange to the new ruble.
Some years in particular coins 1965 - 1975 can only be found in mint sets which makes this very difficult. As of why, I don't know. Maybe there were too many coins in struck in 1961 - 1964 and commemorative coins in 1967 and that didn't require a lot of coins during those 10 years.
5 kopek is actually an interesting denomination - this was the fare used to travel around Moscow metro.
January1may - there's a 1990-M 10 kopek which I am still looking for. It just seems Moscow Mint has produced more error coins compared to Leningrad / St. Petersburg Mint. You'll be suprised to know that sometimes it's cheaper to buy from
ebay than in Russia especially some of the tougher years. I've sold some of my duplicates to people over in Russia.
My partial coin collection
http://www.omnicoin.com/collection/gxseriesMy numismatics articles and collection:
http://www.gxseries.com/numis/numis_index.htmRegularly updated at least once a month.