Peace Back Saws
Harvey Peace manufactured several types of backsaws. Early saws have a traditional style handle, though many feature extra-long horns as you can see in some of the photos below. Later saws, say 1880 and later, have "nosed" handles similar to the saws made by Richardson Brothers and others. Some call this a New York style handle.
No. 60 Carpenters' Delight "Extra"
Steel Back. Apple Handle. This is a specialized saw with a taper-ground plate designed to be used without set. It leaves a fine kerf, cutting quickly and cleanly. It is a very rare saw. I know of only one example. This saw appears in the 1884 and 1890 catalogs.
No. 60 backsaw
Etch
Note the "C" stamped on the heel of the plate where a handsaw would have its PPI stamped.
No. 50 Brass Back
Double refined spring steel. Brass Back, Apple handle. Fully polished. Peace's Top of the line backsaw. This saw appears in the 1869, 1884, and 1890 catalogs. It was offered with an open handle on small saws, a closed handle on larger saws.
No. P47 Perfection Backsaw
This is an odd looking saw with Buell's patent carved handle and the Hankin/Tenney patent reinforcing plate. Adding to the oddness, the handle is "let in" to the plate giving it a very unique appearance. This saw appears in the 1884 and 1890 catalogs. It is a rare saw. I've seen less than a half dozen examples of this model.
No. 45 Backsaw
Spring steel blade. Blued steel back. Apple handle. This saw appears in the 1884 and 1890 catalogs. It does not appear in the 1869 catalog.
No. 40 Backsaw
Spring steel. Blued steel handle. Beech handle. This is an earlier backsaw which only appears int he 1869 catalog.
No. 35 Backsaw
Cast Steel Blade. Beech handle. The only example of a No. 35 backsaw I've seen thus far is a 8 inch open-handle model. It features a cast steel blade, steel spine, and a beech handle. There are two split nuts with a sunken-style medallion. I have not found this model listed in any catalogs so I'm unsure if the #35 was offered with a closed handle or in other lengths. The #35 may have been a lower-price model and offered in similar configurations as the #45 back saw.