I have had a couple of weights like this, and a bottle with exactly matching set-ups in the base and stopper (obviously cut from the same massive complex cane). A similar bottle went through Selman a few years ago. The items are well made, the density is consistent with Bacchus, but I could not find any cane in them that matched a cane in a classic Bacchus weight. So I remain puzzled. That said, I am sure there were a number of English factories that made high quality weights for a short time in the 1850s - not just Bacchus. It is worth bearing in mind that we do not know where Gillinder worked in his few years in Birmingham (it was not at Bacchus though), so it is possible he made these weights at, for example, William Gammon or another high quality maker - but that is speculation.