The origin of this Viking Age buckle can be traced back to a Gotlandic find, likely from the 10th century. The original is housed at the Historical Museum in Stockholm. See:https://samlingar.shm.se/object/9FA7E603-3120-43EE-A3A4-C361CE1DC18A
The buckle is made of bronze and is suitable for a belt that is 27-30 mm wide.
The Viking-era strap end Se-02 typically pairs excellently with this model.