The 4 photos show the Boy & Girl Carrying Double-Barred Cross block for purchase.

United States, 1956 Christmas Seal Printer Mark Block and Constant Flaw, WX179, MNH

Printer W, (Western Lithograph), 56-6, Perf 12 1/2 4S, Block of 18

Seal#56, the Printer Mark "W" is in the bottom row, last seal just below the raised shoe on the right (photo 3).

On Seal#31 (top row, left seal) the 6 in the Date is smaller than the rest. This is a constant flaw among all printers (photo 4).

We have been a stamp collector and enthusiast for 50 years. We consider what we sell are fill ins for the advanced collector or stamps that may be preferred by any collector. We do not provide grading for stamps. We provide Scott numbers when we are sure and have tried to select stamps that are attractive to the eye and practical for mounting.

Stamps are excellent historic and educational tools.

APS Member Number 223336