Thanks IC. From what I understand the S-76A came with the 'regular' 250-C30 (557shp) and the MkII with the 250-C30S, as you say, with 650shp.
As Collective Bias mentions, the MKII became 'standard fayre' (I think from 1982) offering a variety of improvements including this engine upgrade and an improved avionics fit.
Dave B: Bravo!
It would be
great to see your photos (if you can find them) of your trip to inspect the 'Barclaycraft'. Evidently she previously flew as JA6615. Do you happen to know in what role she was employed while in Japan?
Anyone with any observations about the 'A' model, quirks, likes/dislikes, please do chip-in.
Grazie mille.