I have been looking for images of the two Cyprus stamps overprinted: "Sokotra". Please note that the overprint is bogus.
From: The Philatelic Record, February 1892, p. 35.From: The Philatelic Record, February 1892, p. 35.
Sokotra, or Socotra, under which latter mode of spelling, this
island is probably better known to druggists than to philatelists,
has, according to the Timbre, been supplied since the 8th January
last with two postage stamps of ½ anna and 1 anna, the former
being for local correspondence, and that of 1 anna for defraying
the rate to Aden. For this purpose the stamps of Cyprus have
been requisitioned, and those of 1 piastre and 2 piastres have been
surcharged at the foot with the value in Indian currency, and at
the top with "sokotra." The island is the
property of an independent sovereign, but since
1886 has been under British protection.
½ anna on 1 piastre, carmine ; surch. in black. 1 ,, on 2 „ blue „
Images of the two stamps without overprints: