Detroit. Mich. Jul 1 (1851) First Day of Letter Rates, black "5cts" integral due cds obliterated and new red "Detroit. Mich '3 Paid' Jul 1" cds struck on cover to Penfield N.Y., manuscript "Charge Draw. 68 Paid" endorsement at upper right; cover tear top left, F.-V.F., A scarce First Day of the new 3¢ rate. Estimate  $300 - 400. The postal clerk apparently missed the charge box notation and mistakenly struck the black integral due "5cts" cds, but corrected the mistake striking the red "3 Paid" integral cds adjacent. $0 (Image)