12¢ Sheet Stamp - Most On Cover
Currently, the largest known number of the 12¢ sheet stamp on cover, parcel piece, or tag is: 8.
Description: Registered first class letter to Heidelberg, Germany with 8 copies of the 12¢, 12 of the 4¢, four each of the 11¢ and 14¢ Prexies, and a 6¢ transport airmail.
Owner/Source: Richard Pederson
Currently, the second largest known number of the 12¢ sheet stamp on cover, parcel piece, or tag is: 7.
Description: Registered air mail letter to Switzerland with 7 copies of the 12¢ and two of the 3¢ overpaying, by 10¢, double the 30¢ transatlantic air mail rate and the 20¢ registration fee.
Owner/Source: Offered for sale on eBay and then sold/withdrawn.