What's known as a "Seahorse". These were printed three times in this form - in 1913, 1915 and 1918, together with a later slight re-design. The earlier printings are the more desirable (setting aside varieties). Assuming the 2/6 is from 1918, it's worth a £ or two at best - pulled perfs to the top and right, and it's also a perfin (the holes in the design), which usually reduces value. The 5/- is just a space-filler with the corner damage.
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