Inter-Island used a similar livery, with the flag letters ISCoI.
The subsidiary Inter Island Shipping was incorporated at Nelson on 10 October 1951, though Lloyd’s 1953–54 locates it at Picton. It took over Collingwood Shipping in 1960 and was struck off on 29 February 1984, without deregistration.
Keep the explicit scope label independent; no alias or company identity is inferred.