China. 1931. 5 Dollars, P-S2422d S/M#K56-10d, Issued banknote, Green on multicolor underprint, SYS at right, S/N W061025, PMG graded Superb Gem Uncirculated 68 EPQ. Printer: ABNC. This is the highest graded note out of 481 graded in the PMG census, none higher or even tied.
Estimate: $600-1000