This is a simple Atkins "Sheffield Saw Works" 10in backsaw. It has a perfectly clean, straight blade which is 2 1/4in deep under the steel spine. The handle is excellent. The teeth are in good shape but not sharp. It's nothing special, just a solid worker. $28
This is an iconic, unique tool that is at once both easily recognizable and extremely hard to find. It is based on Richardson's April 14, 1885 patent. The idea is that the saw plate is less likely to heat during use, bind, or bend. I've only seen a two or three of these in 20+ years of collecting saws. This one has a near-perfect apple handle. The plate is dark with patina but the area around the etch has been cleaned and much of the language touting the saw's benefits is legible. A very rare chance to get one of these highly desirable saws for your collection. $395