Green’s Dictionary of Slang

sealer n.

[SE sealer, one who affixes a seal to a document]

(UK Und.) ‘one ready to give bond and judgement for goods or money’ (Grose, 1785).

[UK]T. Shadwell Squire of Alsatia n.p.: Cant List: Sealer. One that gives Bonds and Judgement for Goods and Money.
[UK]B.E. Dict. Canting Crew [as cit. 1688].
[UK]New Canting Dict. [as cit. 1688].
[UK]Bailey Universal Etym. Eng. Dict. [as cit. 1688].
[UK]Grose Classical Dict. of the Vulgar Tongue.
[UK]Lex. Balatronicum.
[UK]Egan Grose’s Classical Dict. of the Vulgar Tongue.