cover 12c Black E grill (90), fine stamp, intense shade, used with 30c Orange (71), average-centered, couple short perfs., light indistinct grid cancels on 1868 blue folded letter to Switzerland, Placerville, Cal. c.d.s., red 'Chicago, Ill. 21' exchange h.s. (rate changed to '15' in blue pencil), blue French transit and matching boxed 'PD', Swiss backstamps, fine, an attractive double rate French Mail cover, with 1990 P.F. certificate, Scott retail $535.00+