Cuba, Envelope, 1899, 2c carmine on oriental buff. Registered entire to Tonkin, Vietnam, canceled by partial Puerto Principe cds's (added stamps removed), with Havana, Cuba (FX-HA1) and San Francisco, Cal. (FX-SF1a) registry exchange etiquettes, with S.F., Hong Kong and receiving backstamps, F.-V.F. appearance, still a very rare usage of the Havana, Cuba exchange etiquette (Scott cat $2,000).
Scott No. U15; Estimate $300 - 400. Est. $300-400 (Image)

Est. $300-400