This type of belt buckle is characteristic of the period between 1250 and 1400. It is suitable for a belt that is 17-23 mm wide.
See:
http://www.ukdfd.co.uk/ukdfddata/showrecords.php?product=38373
http://www.ukdfd.co.uk/ukdfddata/showrecords.php?product=41640
http://www.ukdfd.co.uk/ukdfddata/showrecords.php?product=30912
Made of bronze.
