Here's my smallest cover, measuring 4 and 1/8 inches by 1 and 13/16 inches. It is franked with a US Scott #11a in yellowish rose red tied by a blue August 15 Wellington, Ohio, CDS.
The cover was mailed to Brother Theodore Oberlin, Box 358, with no town provided in the address. Brother Oberlin must have lived in Wellington (2010 population 4802), where he marked it as received five days later, on August 20 1856.
Straddling the wax seal on reverse is the request: "Please an . . . swer soon."

