Tumbling Tarns Publique Deposited
An English dialect term for the thick half Pennies of the reign of George III.
John Gait, in The Last of the Lairds, 1826 (iv. 1) has the following: "I gave him a whole penny, twa new bawbees, gude weight, for it was then the days o' the tumbling Tarns."
- Frey's Dictionary (American Journal of Numismatics, Vol. 50, 1916)