One Inch to One Statute Mile. Electrotyped in 1864. Engraved at the Ordnance Map Office in the Tower under the direction of Lieut Colonel Colby by Benjamin Baker and his Assistants. Overall sheet size : 50.9cms x 34.3cms; image size: 478mm x 336 mm inc imprint. Brecknock (Brecon) bottom right . One nick bottom margin else very good condition.
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