sphra·​gis·​tics | \-ks\

Definition of sphragistics 

: the science of seals and signets dealing especially with their history, age, distinctions of types, manner of use, and legal function : sigillography

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History and Etymology for sphragistics

Late Greek sphragistikē (feminine of sphragistikos sphragistic) + English -s (plural suffix)

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a knickknack or trinket

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