CCCP - SSSR - I think that this is one great offer for sale - I found
it in my store in Yugoslavia:

Michel #1 used (canceled only),
5-7, VFU,
9-11 FU,
18y (mint), 19y (mint) 20y used, 23y used,
25-26, FU
213y mint,
255 VFU
200-01 VFU Pushkin cancel (16/II/37),
block 13 Lux mint, and some more - detailed list on request!

Will be glad to know Your opinion.
And who is interested can contact me any time.

best regards
Milco