Boston, Mass. 40¢ Rate Covers. Lot of four folded covers all to San Francisco all with "40" or "80" cent rates, included is two covers with manuscript "80" rate with red cds, one cover with red cds & matching "40" rate & one cover (some staining) with scarce black "Boston/40" integral rate postmark with 2nd type red "40" handstamp, F.-V.F., a scarce group. Estimate  $300 - 400. $0 (Image)