Antique Seth Thomas Adamantine Mantel Shelf 89AD Clock 1916B with key & pendulum

Antique Seth Thomas adamantine clock with key and pendulum – 17″ wide, 7″ deep, and 10.5 tall – good cosmetic condition – untested item from estate – I would guess this has been stored for DECADES AND DECADES and would likely need cleaning to properly test? Shelf location is “GR7″.