Dictionary of Traded Goods and Commodities 1550-1820. Originally published by University of Wolverhampton, Wolverhampton, 2007.
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Squirrel chain
[squirrel-chain]
Squirrel chain is a term not found in the dictionaries and only once in the Dictionary Archive among a list of knick-knacks and TOYs [Tradecards (1698)]. Probably it was similar to a WATCH CHAIN or SCISSORS CHAIN, being decorative, but suitable for keeping small items of value or use safe when carrying them on ones person.
Not found in the OED online
Sources: Tradecards.