Here's another interesting stone from Plymouth, MA. Most of the work — the lettering and the stars — was done by the same carver who was responsible for those strange, possibly machine-made urns.
The central design is wholly different. The hand-carved ship and waves are lovely and the angel, while slightly awkward, is nice in an American primitive sort of way. I'm sure I've seen something similar painted on a wooden shingle or stitched on a pillow in the Old Sturbridge Village gift shop.
The image of an angel watching over a ship isn't exactly subtle, but it is poignant in a graveyard crowded with cenotaphs dedicated to men who died at sea.