vertical strip of four on large part parcel wrapper postmarked "Fort Amador Canal Zone Sep 7 1946", addressed to U.S. Naval Hospital in Corona, California, various handstamps including "Insured No. 2590" and "Passed Free U.S. Customs at Miami, Fla.", very fine, $4.00 pays 37 times the 10c ½ ounce rate plus 25c insurance (plus 5c convenience overpay)