Hello all, BSSM is unclear on this one. There are planemakers catalogued at various dates between 1803 and 1868, but a date of around 1900 is ascribed to a saw with a mark remarkably similar to mine. With the caveat that open handled backsaws are notoriously difficult to date. I am a little at sea on this one. It could well be 1900 but there is a slight chamfer to the brass back and the handle is 0.97 of an inch thick and which, for a 9 inch saw probably means that it has been a good saw in its day. Possibly too good for a run of the mill merchant/retailer of the late 19th/early 20th century. I say merchant/retailer owing to the absence of any recorded makers. Does anyone have any ideas? Fred