I believe I answered my own question. Here is hat I found on Portable Antiquities Scheme. This is a description of another one just like one I posted. Same Jetton:
JETTON
Unique ID: BH-1C9470
Object type certainty: Certain
Workflow status: Awaiting validation
A Late Medieval copper-alloy jetton, 'Crown' design, probably struck at Paris during the early 15th century (see Mitchiner 1988: 194).
Dimensions: 25.9mm diameter, 0.9mm thick. Weight: 3g.
Subsequent actions
Subsequent action after recording: Returned to finder
Chronology
Broad period: MEDIEVAL
Period from: MEDIEVAL
Date from: Circa AD 1418
Date to: Circa AD 1437
Dimensions and weight
Quantity: 1
Thickness: 0.9 mm
Weight: 3 g
Diameter: 25.9 mm