Watch List notes:

BANKNOTES. CHINA - PROVINCIAL BANKS Frontier Bank: Uniface Obverse and Reverse Proof $5, brown/brown; Uniface Reverse Proof $1, green, and $10, blue, all 1 July 1925, unperforated and all Reverse Proofs mounted on card stock, ABNC Archive Proofs (P S2570, S2568, S2572). Uncirculated.
(4pcs)

Estimate: US$450-550