This Sterling Silver Belt buckle by Blackinton measures about 1 3/4 inch in length and 1 5/8 inch at its widest point. It is made for a1 inch belt. I think this one is actually old store inventory, never worn. It has some shop wear, minor surface scratching. A good buffing would restore it to like new finish.
The piece is marked "Sterling", with the Blackinton mark and the style number 1043. The buckle weighs about 22 grams.
I have this same buckle with a more conventional closure listed, Sterling Silver Belt Buckle by Blackinton 2795.
Sterling Silver Belt Buckle by Blackinton 1043