17th Century Trade Tokens
Tokens were struck by many traders between 1648 and 1672, and semi-officially tolerated, in a period when there was insufficient officially available small change.
From ‘Buckinghamshire Trade Tokens issued in the Seventeenth Century’ by GC Williamson, reprinted by Seaby.

Page 173
(See also pages 196 and 197 which refer to tokens probably issued in Northall.

Page 203