This set took me close to a decade to complete. It's because I wasn't prepared to pay top dollars and am happy to wait for one at a reasonable price. Struck with the same planchets used for the Soviet coins - these were struck at Leningrad Mint Looks quite neat as a set. I thought I would complete the 1946 Spitsbergen set first before this. Link: http://gxseries.com/numis/rus_new_type/tannu_tuva.htm
Very nice, I myself have been looking for a Tannu Tuva coin or two in junk bins for a while, but no luck yet. On the Spitsbergen set, if I recall those got pricy even for single coins. I prefer Svalbard though instead of the Dutch name.