Letterlocking: Pt. 1: Spiral Lock with slits parallel to fore-edge, England (1600s) (UH0018) from hot bl Watch Video
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Description: Modelled after Henry Howard, Earl of Northampton’s spiral-locked letter to his cousin Sir Richard Leveson (c.1600), the British Library, Papers of Sir Robert Harley Papers, Add. MS 70107 Misc. 28, Letter 2. See also Pt. 2. detail inside spiral lock w/ slit parallel to fore-edge, England (1600s).nnModel found in the Massachusetts Institute of Technology Libraries (MIT), Unlocking History Research Group archive, MC 0760. nnThis is a model of the highest level of built-in security found in Letter