During a visit to the Smithsonian Institution National Postal Museum the past July, Bill Welch and I were privileged to examine some of these rare items that are in the Michel Postal Stationary of the World Collection, which is comprised of 143 volumes and several boxes. It was donated by A. Eugene Michel on June 12, 1940 (Accession Number 152441). I want to thank Tom Lera, Winston M. Blount Research Chair, and Jim O’Donnell, NPM Museum Specialist for providing illustrations of all these covers.

15c envelope used from Puerto Plate to Germany, 7 January 1890

Reverse
The high values in the collection:
On parchment like paper

60c (210 x 93 mm)

60c (240 x 101 mm)

75c

1 Peso
On Laid Paper

60c on white

60c on blue

75c on yellow
The book is at the American Philatelic Research Library.
The Smithsonian National Postal Museum is open seven days a week from 10 a.m. to 5:30 p.m., except December 25. Admission is free.