hinged clasps

Source reference: 

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

Used as preferred label for