1978 15¢ Viking Missions to Mars Plate Block

United States #1758 15¢ Photography Plate Block

United States #1768 15¢ Christmas - Madonna Plate Block

United States #1735 15¢ "A" Definitive (Gravure) Plate Block

United States #1769 15¢ Christmas - Hobby Horse Plate Block

United States #1733 13¢ "Resolution" Plate Block

United States #1760-63 15¢ American Owls - 4 Varieties, Attached Plate Block Varieties: #1760 - Great Gray Owl #1761 - Saw-Whet Owl #1762 - Barred Owl #1763 - Great Horned Owl *Plate number and...

United States #1764-67 15¢ Trees Mint Se-tenant Block of 4

United States #1753 13¢ French Alliance Plate Block

United States #1754 13¢ Dr. Papanicolaou Plate Block