John Buchanan? small vase with B mark

I’ve split this pot from the ‘small bowl/vase’ thread because the marks aren’t the same

potterymad62 wrote:Also many moons back I sold a vase with a similar mark. Is it the same pottery and potter, just a thought.

I’ve seen a few with this mark, including a whole tea set. It’s very like John Buchanan’s personal mark in the Marks book. But different from the mark on the porcelain vase in the opening post.