[Lev Lafayette]

The module explicitly suggests that Saltmarsh is modelled on a fishing village of the fourteenth century, which makes "The Sea Ghost" look a little advanced, but not terribly so (visually it looks rather like a late 15th century caravel). It is certainly passable as a type of cog which had been around since the 10th century and were particularly used for Baltic and Frisian trade.

The 'U' series stood for "Underwater", not that there's too much time spent in such locale. The "UK" were a different series altogether (which I'll review sometime in the far future), however the U series was published first (U1 1981, UK1 1983)

I also should say that as much as I'm enjoying reviewing these they're not retro in playtesting. Most of my reviews are based on material that I've used quite recently.