Gustav Becker 400-day torsion pendulum clock, also referred to as an anniversary clock, featuring a brass construction with visible wear. The clock measures 13 in high and 7 in diameter. It has an enamel dial with Arabic numerals and includes a four-ball rotating pendulum beneath a protective glass dome. This mechanical clock operates for approximately 400 days on a single winding. It includes Gustav Becker's hallmark and other inscriptions on the brass backplate. Clock needs work. Gustav Becker was a prominent German clockmaker producing these pieces during the late 19th and early 20th centuries.