Bought in 1721 as Transit Clock.
According to Howse Last recorded at Observatory in 1818. However, inventory (RSMS372/170) records the clock as a two day clock with simple pendulum.
Possibly the clock put up for sale at Christies on 10 March 1983, which is described in an advert for the sale as a 'George Graham walnut longcase regulator, supplied to the Royal Observatory at Greenwich in 1721'.
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