Coo, that's interesting. You have one of the very first Skipper Mariners, probably from 1971. In 1972 the cabin and deck moulding was completely revamped to give essential the shape which went on for years and ended up as the Eagle 525, available until about ten years ago.
yeh have been reading a bit about it,will have a sail in her Monday hopefully
Can you paint her to look like a bottlenose dolphin? My parents had the very first of the later (1972 onwards) model.