BPCo Triangle Seal

BP Co Triangle Seal, Image & Found by Lancastrian.
From the Yorks/Lancs boarder area.

A bag seal with a triangular indentation containing faint script BPCo The other side is blank.

Possibly BARCLAY PERKINS & Co ? See:- Barclay and Perkins Company Limited : owner of Anchor brewery 1781-1955