Trapper - probably 1920s, a slimmed down version of the larger trapper such as the R1123 Remington Bullet, introduced 9/1922. Those are in turn a 2-blade version of the swell-center regular hunting knife (see below).
Stockman - 1880s. The earliest ones were of uniform width, round ended, and often had a long slim spear master blade. The clip master blade had become standard by 1900, as did the slightly tapering frame.
Barlow - the earliest barlows, characterized by long front bolster and no cap bolster, go back to the 17th century. The modern regular jack barlow probably goes back to the 3rd quarter of the 19th century (1850-75), or maybe a few years before that. For earlier styles, from 1816, see page 210 of LG4.
Sodbuster - originally a German pattern with wooden handles, called a Folding Butcher Knife. I've seen them from the early part of the 20th century, and they might go back a lot further, since both the handle shape and the blade shape go back to ancient times (on fixed blades). But I have not SEEN any that were older.
Folding Hunter (like the non-locking Camillus Model 26) - clasp-type folding hunters first appeared around 1900. They are American versions of the clasp knives made in France, Spain, Italy, Bohemia, etc. However the swell-center folding hunter (Winchester 1920, etc) is a lot older; I have seen Sheffield examples from before 1850. And the swell-center regular hunting knife (mis-named 1-blade trapper, though it is much older than the trapper) is nearly that old.
All this information is in the pattern chapters of LG4.
BRL...
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