hinged clasps

Clasps attached directly to hinge plates by means of pin hinges.

Clarkson, Further Studies... (1996)

Christopher Clarkson (1996), “Further Studies in Anglos-Saxon and Norman Bookbinding: Board Attachment Methods Re-Examined”, in Roger Powell, the Compleat Binder: Liber Amicorum, edited by John L Sharpe, 14, Bibliologia, Turnhout, Brepols, pp. 154–214.

Additional reference: 
p. 209 (modified)
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