Watch List notes:

Elizabeth Petrovna (1741-1761), Novodel Proof Rouble, 1757 over 6, Moscow, crowned, draped and cuirassed bust right, rev. crowned double-headed eagle, edge obliquely grained, 2.48g, 1h (Sev - [cf. 220]; Bitkin 67 [R1]; Diakov 422 [R1]), a truly sensational coin with rich pools of mint bloom across brilliant surfaces, a trace of rust to reverse die, otherwise much as struck, extremely rare

provenance
Kroisos, Stack's, 14 January 2008, lot 3150