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The eagle eyes of Londonist's Matt Brown spotted these plaques. They're at Barbican station, on the southern-most platform, which is closed and inaccessible so the 'close-up' photo is a zoom from another platform.

A history information panel at the station informs that it was opened as 'Aldersgate Street' on 23 December 1865 a date which tallies with that on the boundary stones (1865/8). We'd guess new stones were needed because the walls they used to be on were demolished during the construction of the station, and/or the introduction of the railway caused the boundaries to be moved.