1736 Canting Dictionary / R / RUM-Peepers [thing]
a Silver Looking-glass.
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ABCDEFGHIJKLMNOPQRSTUVWXYZ
Entry taken from 1736 Canting Dictionary, by Nathan Bailey.
Rum Peepers in the 1811 Vulgar Tongue
Also see examples in Canting Songs and Slang Rhymes collected by John S. Farmer (1896).