Estonian registered covers to ROC (Taiwan)

[Gulfmann]

Estonian registered cover, posted on April 10, 1996
from Narva to Taipei, the registered cover was
mis-sent to mainland China, the cover was cancelled
with a blue color mis-sent cancellation on front
central side.

[Gulfmann]

Former Soviet Union registered cover, posted on
October 9, 1991 from Tallinn to Taipei,
clear arrival postmarkings on back side.