The former three stages reflect the major process of eclogite facies metamorphism and the latest stages the light overprinting of greenschist facies retrometamorphism at the shallow level of crust.

前三个阶段反映了相变质作用主要过程。后一阶段，反映了在地壳部层次绿片相环境下遭受轻微叠加改造。

Set of stamps in the above designs and in a third design showing a woman quilling was prepared in 1920, but not issued price of set, $4, exist with “SPECIMEN” overprint and imperf counterfeits exist.

1920年美尼票样票，因印刷套印错误，未发行，存世仅有样票和有缺陷伪造票（膺品票）。