cover Federal Hill, Reminiscence of Baltimore, Md., view of encampment overlooking harbor with many ships and the city beyond (unlisted in Walcott, similar to Walcott #752, but different design of Baltimore) in pale blue on patriotic cover to Mass., franked with average 3c Rose (65), stamp trimmed at L. prior to use, tied by blue Baltimore, Md. c.d.s., otherwise very fine, very scarce overall design photo