Tool type
The saws here are all Disstons, from 26-inch hand saws down to small dovetail saws. Strictly, a hand saw is the 26-inch size. Anything 24 inches or shorter is a panel saw, and saws 28 inches and longer are nearly always rip saws. Rip teeth are filed straight across for cutting along the grain, while crosscut teeth are beveled to slice across it, so read the points-per-inch number stamped near the heel. Back saws have a folded steel or brass back that stiffens a thinner blade for joinery, in sizes from small dovetail saws up to 32-inch miter-box saws. Disston made its own saw steel from 1855, and the medallion in the handle dates most of its saws to within a few years.
5 models we cover.

Disston · Hand saw
D-8late 1870s–1955, sold on under H. K. Porter into the 1970s
$50–$130 typical ask
111 on eBay

Disston · Hand saw
D-231911–1955 (lesser H. K. Porter versions to the early 1990s)
$50–$90 typical ask
159 on eBay

Disston · Hand saw
No. 12about 1865–1928 (then the D-12 to about 1953)
$95–$250 typical ask
14 on eBay

Disston · Hand saw
No. 4 (14 in.)by 1876–1955
$50–$75 typical ask
13 on eBay

Disston · Hand saw
No. 68 / No. 70 / No. 71No. 68 by 1906–1955; No. 70 and No. 71 to about 1945
$100–$180 typical ask
10 on eBay