Series 521 $10 MPC, the largest denomination was the $10 until the Series 661 came out in 1968. The 521 series was used from 1954-1958, mostly in Europe.
The series 661 notes were issued mostly in Asia and Viet-Nam in particular, by this time the $20 was being issued, first in the series 661 notes. The image on the reverse should be familiar to collectors of early 20th Century Philippine Islands notes, she was on the 50 Peso note issued from 1908-1920's. In fact on several of the MPC's issued during the 1950's-1960's vignettes were used that originated on old National Bank Notes or even on Philippine Island notes.
Lovely notes as allways SM and something I need to add to my Mill Scrip collection some time real soon
