Grimy broken clock turns out to be rare gem ← Related Article Visit The Boston Globe Share on Twitter Share on Facebook Comment on this Scroll to top of page Barry Chin/Globe Staff An extremely rare Astronomical Regulator clock has been restored at E.B. Horn Co. jewelers at Downtown Crossing in Boston. Barry Chin/Globe Staff Michael Finn and son Doug in front of the rare 19th-century clock at E.B. Horn Co. jewelers at Downtown Crossing. Barry Chin/Globe Staff The original winder for the clock and the original key for the clock's cabinet. Barry Chin/Globe Staff The three missing hands of the clock were fabricated by clockmaker Paul S. Calantropo, who also did the clock's restoration. Barry Chin/Globe Staff Clock restorer Paul Calantropo at work. Barry Chin/Globe Staff The pendulum now contains small metal bearings. Barry Chin/Globe Staff “I knew that [the clock] had some history with the shop, but not much more,” says Michael Finn of E.B. Horn Co. EBHornClock Customers and employees at E.B. Horn in 1905. EBHornClock Washington Street back in the early 19th century. EBHornClock The street near E.B. Horn on a crowded day in 1921.