Watch List notes:

15 Kopecks 1912 CПБ-BC.
Bit 138 (R3), Sev 4158 (R). Authenticated and graded by PCGS MS 65 PL. A truly brilliant coin with great eye appeal, a very rare date/initials combination that shoots up to extremely rare this nice. Perhaps the best known, this cataloger believes it to be a Proof strike. Gem PROOF