cover 1899 (22 Jan.) XU5 to Paris via Haiphong (25.1) showing on reverse rare "LUNGCHOW" "dollar chop" in brown denoting pre-payment in cash and bearing on front French Indo-China 25c cancelled by "LANG-SOM/TONKIN" c.d.s. (28.1), the cover has light filing crease and has been roughly opened through address panel at foot nevertheless a very rare and distinctive usage of this elusive "dollar chop". Photo