wag-on-wall
n.— «Wag-on-wall (also known as a French wall clock): This can be recognized by a large pendulum with massive weights, dial and hands mounted as a wall unit without a case. Those most often found are late 19th century.» —“Clock names, terms can be confusing” State Island Advance (New York City) June 2, 2005. (source: Double-Tongued Dictionary)
Further reading
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