37, 46 (37, 45a) 1933 AP 12 Registered cover from St. Kitts-Nevis to U.S., franked with correct ½d 2oz rate to U.S. + 3d registration fee, tied with the scarce sub P.O. "Dieppe Bay" cds and purple "Boston Mass. \ Registered" transit on back, opened on right side, pristine.
