The Post’s Jan. 20 report about the National Postal Museum [“Closer Inspection,” Magazine] said: “Some of the smallest stamps ever were issued in Mecklenburg-Schwerin in 1856. The former German state printed a standard postage stamp that could be split into four stamps measuring 10 square millimeters.” Closer inspection shows that each of those stamps is 10 millimeters square (10 millimeters on each side). That means each stamp is 100 square millimeters.

Hank Wallace, Washington