Recently I found this $5 Moore airmail cover in Italy. Who can figure out the rate?
The cover is sent by airmail from New York, N.Y. to Milano, Italy in May 1967 and it's registered. All the necessary cancels are there.
Alas, Tony's "US International Postal Rates" book is not helpful for this one; it only gives 20c (per 0.5 ounce) for international airmail postage and 75c for international registry.
Scott gives a high price for a solo use.
Who can help?