Preferred label

Lock–Same substrate, attached        

Alternative label

Slit triangle wrap lock; Tongue; LSA; Single layer locking mechanism        

Scope note

A lock cut into or sliced internally from the writing substrate of the letter, but not detached entirely before it is used to secure the letterpacket shut. A folded single-layer flap can also be a lock-SA SA. signifies “same substrate, attached.” Also referred to as lock-SA.        

Parent concept

Lock       

uh-linked-data/concept/309        

Related concept                                                     

Locking mechanism       

uh-linked-data/concept/319

The Arts & Architecture ThesaurusⓇ Online, The Getty Research Institute. Concept uri

Not in AAT       

The Language of Bindings Thesaurus (LoB) Concept uri

 Not in LoB

Scope note source reference

Source

Jana Dambrogio, Daniel Starza Smith, and the Unlocking History Research Group. Letterlocking, The Hidden History of the Letter. Cambridge and London: MIT Press, 2025.

Unlocking History Concept uri

uh-linked-data/concept/315