evansb,
The Series 2 Twin Pin was produced with the P&W R1340 Wasp for certain markets.
That Philippine Airlines example pictured earlier would have been one of those.
The surviving 'BHP' one in Oz mentioned by megan would be VH-AIS (Australian Iron and Steel).
That's been sitting for years rotting at the side of an airstrip in Queensland due to ownership/ financial problems.
A real shame, considering it had had a real lot of money spent on it not long before that.
No doubt a suitable offer would secure it on an "as is, where is" basis.