single used alongside pair of 1906 2c on 1p Lake (17a), tied by August 22, 1906 Cristobal duplexes to cover to Gore, New Zealand, few trivial creases do not detract from the appearance of this remarkable cover, one of just two examples of this error on cover, a gem of Canal Zone Philately which has not been on the market in over 25 years, 1995 Philatelic Foundation certificate (Scott $2,000 for used)