Watch List notes:

CHINA--FOREIGN BANKS. Russo-Chinese Bank 50 Mexican Dollars, ND (1909). P-S544pe.
(S/M#O5-43) Primary design impression in black on bond paper. Shanghai branch. Engraved signatures at left and center. Archival stamp at lower left with annotation at right. A design missing from even the most comprehensive collections. PMG Uncirculated 62.