Western Union Mail and Stage Co., San Francisco, blue corner card, used with 2c Red Brown (210) natural straight edge at right, tied by large double circle, partly clear 1887 Castroville Cal. datestamp, to Hollister Cal., San Francisco backstamp, slightly irregular reduction at left just clear of corner card, light toning, otherwise intact and nearly fine, scarce and interesting, it is doubtful that this is a frank, the San Francisco backstamp is a 'transit' marking, illustrated in Nathan, where the speculative aspects of its inclusion are made clear