The upper stone gives a date of 1777 - presumably the construction of the bridge. Historically this bridge was on the boundary between Buckinghamshire and Middlesex. It was also the boundary of the Metropolitan Police District and hence the lower plate which is a Coal tax plate "Nail" Number 78. It is made of cast iron and is about 10 inches square.
The plate and the post (right) were both erected in 1861.
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Coal tax obelisk "Nail" Number 111 at {{gbmapping|TQ148618}} in Oxshott on the southeast side of the railway embankment, southwest of Stokesheath Road. It is made of cast iron on a stone plinth and