I shared these photos of a brass saw marked "R Williamson & Co. Cast ● Steel" with Simon Barley, but he is unsure if it is English or American. He did state that the ● between Cast Steel and the low position of the stamp indicate a probable date of pre-1840. He has a steel-backed example of the mark in BSSM, but indicates in the book that he is unsure of its heritage. He did mention that the handle on my saw is likely a replacement and was probably an open handle originally. The mark is included in the EAIA database, however it is based on a single example that was in the hands of a collector, briefly mentioned in a 1983 article in the Gristmill publication of the Mid-west Tool Collectors Association. I have checked a few early city directories, including Boston, New York, Philadelphia, and Chicago, but have not yet located an R. Williamson who was a saw maker or similar profession. Does anyone have thoughts on who R. Williamson was and where he worked?