Solomon Islands 1957 incoming cover with large Barakoma h/s

1957 (12 DE) incoming airmail cover from New Zealand to Vella Lavella franked by NZ 1953-59 1/2d slate-black (pair) and 1955-59 2d bluish-green tied by two despatch cds. Redirected on arrival to Sohano New Guinea with S/L 31 DEC 1957 datestamp and large BARAKOMA H/S applied as transit marks both tieing the 2d adhesive. Backstamped at Rabaul (31 DE). A very fine and rare usage of the large straight line H/S with no other comparable usages known to us. Original Purchased from Stanley Gibbons (Still on their card)