QUOTE(gxseries @ Mar 22 2008, 11:41 PM)

I don't think they are struck in one full ounce but somewhere at 20 grams or so if I am not mistaken. 50 kopeks is 10 grams, same specification from the old Tsarist era.
The coins were struck to the old Tsarist standard.
Whatever the reason (civil war, hostile foreign powers, inherent communist inefficiencies, famine, political threats to communist rule - take your pick), the Communist government hyperinflated the rouble to meet its spending requirements by printing massive amounts of paper money.
In order to stabilize the rouble, Lenin brought in the NEP (New Economic Policy) which allowed for a bit more private economic activity and introduced a money that would be accepted by the people - communist coins in silver and copper, struck to the specifications of the old familiar Tsarist coinage. Gold was also struck, but I think only for purposes of foreign trade rather than for circulation within the RSFSR/USSR.
The NEP produced some economic revival within the country, allowing the Communist government time to consolidate its grip on power. Once secured, the NEP was reversed by Stalin and the Tsarist specification coins were replaced with a token base metal coinage.