cover Baltimore, Md., 1c Blue on white (1LB3), large margins to just clear at R., ms. penstroke cancel (not tied), used in combination with 3c Orange Brown (10), large margins to just touching at T., tied by grid cancel on buff cover, 'Baltimore Md Apr 6' c.d.s., cover has neat ms. docketing at L., very fine, with 1990 P.F. certificate, Scott retail $500.00+ (combination usages unpriced) photo