MILITARY PAYMENT CERTIFICATES. Lot of three (3). Series 661 and 681. Includes: Series 661 10¢. In PMG encapsulation 80575509, graded Gem New 65PPQ // Series 661 $1. In PMG encapsulation 80575493, graded Very Choice New 64 // Series 681 10¢. Interesting submarine and astronaut vignettes. . Three (3) notes in lot.