The spade shaped buckle comes in a variety of sizes. This one is 4.5 cm long and intended as a belt buckle or purse closure.
Measurements:
Spade L = 4.5 cm, W = 4 cm, Strap size = 1.7 cm
This buckle is based on an example from an archeological site and can be seen on page 239 of the book by V. V. Sedov. "Eastern Slavs in the VI-XIII centuries." https://www.archaeolog.ru/ru/el-bib/el-cat/el-series/arch-sssr/archaeologyussr_02
