1) Modern obsolete currency 
Sovznaks (совзнак) were promissory notes issued in Soviet Russia in 1919 and used during 1919-1924. The name is an abbreviation of the expression `Sovetskiye znaki` (Советские знаки, Soviet tokens), which in its turn was an abbreviation of the official terms (советские казначейские знаки, расчё.....