Incidentally I think the last Astazou-engined Skyvan went to the scrappy back in the 1990s, it was owned by a University in the USA ( Wisconsin? perhaps ) as an instructional airframe.
All the others had already been scrapped or converted to Garretts. Why did they go with those instead of PT6A I wonder?
Pity the UAS haven't shown much interest in preserving the type.