Unlisted mule, by George Champney, of Apollo Belverdere paired with a Russian Imperial Eagle with crest of Kazan copper 39mm. Champney was in Russia in 1876, where he produced a mule from an Italian 20 lire obverse & a Russian 20 kopeck obverse. So I think that this medal mule is from around that date, seeing as both medals he used for it are Russian ones, though I have not been able to locate the exact medals used.