The sheet is marked 'Antiquarian Journal - page 63 fig.3 vol. 45 - Sir Richard Lee's proposed system of fortification 1558 Brass Bastion'. This refers to an article by Iain McIvor in the 1965 volume of The Antiquaries Journal.
This is part of the Job: PF/BWF/003 Sheets Showing Historic Periods Of Development To Berwick-Upon-Tweed's Fortifications; within the Volume: PF/BWF Berwick-Upon-Tweed Castle And Fortifications, Northumberland; within the Series: EHC01/022 English Heritage Plans And Measured Drawings; within the Collection: EHC01 English Heritage(Eh):Archive
UNCERTAIN
Tudor Town Defences