You've bought a cracker there Ed. Another of our guns that's found its way over the pond! I have found reference to Onions & Wheelock in Birmingham in 1840 in an old book. There were quite a few Onions working in the Trade in Birmingham working as barrel filers and other associated trades. It seems to have been quite a dynasty. Proof marks are right for the period in Birmingham. There appears to be a workman's initials that look like M & S. I've gone through what I have without success. I think you got a good buy there and one that I would have been very happy with at that price. Lagopus…..
