This model is based on a find from Gotland, now housed at the Historical Museum in Stockholm. Made of bronze.
See: link to the item on the Historical Museum’s website
This find is also very similar: link to the item on the Historical Museum’s website
Fits a strap that is 16-18 mm wide. The buckle is easily attached by bending the pins on the back.
Alternatively, it can also be fastened with rivets, but this requires the manufacture of rivet washers – small metal plates with holes for rivets, which are placed on the back and then placed over the rivet, and then hammered out.