Ichang Covers Internal Mail 1896 (Dec.) envelope to the Swedish-Norwegian Consulate in Shanghai

Ichang
Covers
Internal Mail
1896 (Dec.) envelope to the Swedish-Norwegian Consulate in Shanghai bearing 1896 2ca. in violet on 3m. red (a very faint surcharge) cancelled by an indistinct boxed datestamp, the reverse with Hankow Local Post c.d.s. (28.12) in black and postman's pencil delivery notation; there is a vertical crease. A very rare cover which is thought to be the only example of this scarce violet surcharge stamp used on cover