help id this

Any help identifying would be appreciated. I dug this item the other day and from what I can get off of it is the stamp “B.B.” “IV” and the British broad arrow stamp. Not sure if anyone can assist me with this what it was used for. Thanks in advance.

Found These Two Artifacts In Oregon, On Some Farmland Dating Back To The 1800's. I Believe It To Be A Buckle, And A Button But Not Sure. Can Anyone Help Identify Them Please? Front side of buckle. The buckle is 2 inches in length and 1 inch 5/8 in width. When My Nokta Makro Simplex+ detects...