BSA C15 PETROL TANK FUEL B40? PRE-65 TRIALS VINTAGE MOTORCYCLE

BSA B40 tank bought for a project but not used, looks like it may have been filled or rubbed down , pear shaped

badge location 40-8079.

dry stored there is surface rust inside but seems solid, threads look ok. pictures are all of the same tank just different light.

selling other B40 spares