Postal History: 1920 (7 Oct) 'Wilson' registered cover to Birmingham with 1917-20 ½d KGV block of 4 cancelled Aitutaki cds, also tied by boxed 'INSUFFICIENTLY PREPAID', and with registration label with 'AITUTAKI' handstamp in pink, and mss 'T6d' in blue crayon. Struck with '6D/466' on arrival and two G.B. 3d postage dues affixed, and with Rarotonga and Liverpool backstamps. Fine and rare underpaid mail from the island