The registered cover shown above originated in New York, NY, June 19, 1937, and was sent to Europe by surface transportation. However, since it was endorsed Via AIR-MAIL from Cherbourg, when it reached the French port of Cherbourg (probably by ferry from Portsmouth, England), it was transported by air to Luxembourg-Ville (or perhaps Paris or Brussels, as regular airmail service from Luxembourg had not yet been established), and was received in Luxembourg on June 28, 1937.
Assuming a letter of not more than ½ oz., the 23 cents postage paid the following charges:
- .05 Surface letter to Europe
- .15 International registry fee
- .03 Airmail surcharge within Europe (per 1/2 oz.)