This buckle is based on a discovery from Northamptonshire, England, dating back to 1250-1400.
See: https://finds.org.uk/database/artefacts/record/id/146744.
There are several findings of this model from the same period. See:
- https://finds.org.uk/database/artefacts/record/id/533524
- http://www.ukdfd.co.uk/ukdfddata/showrecords.php?product=30847
- https://finds.org.uk/database/artefacts/record/id/470197
It fits a belt that is approximately 22 mm wide.