This most likely relates to the sheet of drawings of fittings for new gates for the castle's gatehouse, MP/DON0023.
This is part of the Volume: PF/DON Donnington Castle, Donnington, Berkshire; within the Series: EHC01/022 English Heritage Plans and Measured Drawings; within the Collection: EHC01 English Heritage(EH):Archive
Copyright Crown Copyright. Historic England Archive
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Creator of Archive: Ministry Of Works