(New York) New York, July 23, clamshell postmark with red manuscript "51" cent rating on 1801 folded letter to Baltimore Md., forwarded with red "Balte. Md. Jul 26" cds and red manuscript "30" rating to Washington D.C., Very Fine, The Baltimore cds is the first Federally issued postmark type. Estimate  $200 - 300. $0 (Image)