Muscongus Bay Boat
The Muscongus Bay sloop was a very popular inshore fishing (hand lining) and lobstering boat type in mid-coast Maine in the mid 19th century. Locally called sloop boats, small ones like this evolved into larger sloop boats, thirty feet or so long, commonly called Friendship sloops as many were built in Friendship. This boat has Bristol on her trailboard which may indicate her town.
This image is from G. Brown Goode's The Fisheries and Fishery Industries of the United States, 1884-1887. This book can be found online at NOAA