|This little two-masted sailing ship has a lot in common with the more elaborate sailing vessels in similar flasks made by someone living in a soldier's or sailor's home. There are nine on this website which are probably made by the same artist, but this one is plainer, less decorated, and lacks the elaborate stoppers in the other bottles. However, the string of beads connecting the ends of the stopper crossbar were made with the same technique as the others.
Look at any one of the others to compare. This page has links to the other eight.