Cayman Is SG38a 1/4d Grey-brown block on none philatelic cover Very RARE

1913 Block of four of the 1/4d brown issues on reverse cancelled by Stake Bay (3 MY 1913) affected by a central vertical crease Kingston machine cancel (6 MY 1913) also on back. A scarce non-philatelic franking. Ex Watkin Ex Meredith. Ex Booth