Registered letter with 104L. (double weight fro special Austrian Lloyd rate- and again doubled for registration) from Argostolion Aug 30th, 1867 to Kerkyra. The only known registered letter between the Islands. A very fine REGISTERED inter-Ionian Island rate of the greatest rarity. Most probably unique. Certificate P.Holcombe (1988). (Hellas 15ba+19f+22a).