Boker U.S.A. made (some of this info is German and/or Argentine, but Boker made knives in the U.S. for a very long history:
Hermann Boeker immigrated to New York in 1887 and founded H.Boker & Co., Boker also owned Valley Forge cutlery and were also contracted to make knives for many other cutlers including Case.
H. Boker & Co's made knives for C. Platts & Sons in the early 1900's as Platts had been contracting knives out at that period of time, both companies were located in New York.
I found these list of Cutlers Boker has made knives for, don't remember where I found these or how accurate they are:
Arbolito - Spanish for "little tree". South American branch. Argentina.
Boker Plus - Boker's current "international" brand. Made in Tiawan and China.
Boker USA - Started in 1899 when H. Boker & Co. purchased the Valley Forge plant. Ended U.S. production in 1983.
Casa Boker - Hardware store founded in 1865 by Robert Boker. Sold knives and hardware improted from USA, Germany and England. Known as "the Sears of Mexico".
Cinch - Current manufacture in Solingen.
Cooper Group - Purchased Boker USA from J. Wiss in 1977. Moved production to Statesboro, GA. Ended US production in 1983.
Cyclops Steel - Purchased by Barl F. Boker in 1916. Sold in 1926. Titusville, PA.
George Schrade - Purchased by Boker ni 1956. Closed in 1958
H. Boker & Company - Founded in NY in 1837 by Hermann Boker. Imported cutlery from Germany. Began making knives in the US with the purchase of Valley Forge cutlery in 1899.
H. Dorwal - Knives made by Boker in Solingen, distributed by the Remsheid Bokers for the Canadian market.*
Heinrich Boker - Official name of the factory in Solingen. Opened in 1869.
Hen and Rooster - Boker made knives in Solingen for Frost. Recent.
Henry Boker - Brand name associated with the Remsheid Bokers. Mostly sold in Australia. Also used on many hand tools in that country.
J. Wiss & Sons - purchased Boker USA in 1969.
J.A. Henkels - Contracted knives made by Boker Solingen. Dates uncertain (1960 - present ???)
John Newton (Sheffield) - Made by Boker USA, Newark, NJ, circa 1906.
John Primble - knives sold by Belknap. Boker USA made knives sold under the Primble trademark from circa 1940s - early 1980s. Primble knives made by Boker have a star on the pattern number stamped on the tang.
Litton Industries - Owned Boker USA in 1968. Sold to J. Wiss in 1969.
Magnum - Knives made in China.
New Britain - Toolmaking company in Connecticutt. Purchased Boker USA in 1965. Bought by Litton Industries circa 1968.
Olde Stag - trademark patented by Boker in 1975 to identify knives made with "del-bone" (delrin) imitation stag handles.
Radium - Blade etch on some Boker knives from early 1900s. History unknown
Rainbow (Providence, RI) - made by Boker USA circa 1933-1954
Razor Steel - Etched on some Boker USA blades circa 1940-1950
Riverside Cut. Co. NY - Made by Boker USA circa 1918
Tree Brand - The Boker brand, USA and Solingen, as it is sometimes called.
Tree Brand Classic - trademark patented in 1974 - used on knife patterns that have been around for a while...
United Boker - Contract knives made by Boker circa 1984-1994.
Valley Forge - Company purchased by H. Boker & Co. in 1899. Closed original plant in 1921, but continued to manufacture Valley Forge knives alongside Boker USA knives in the Maplewood, NJ plant until the 1950s.
Whitehead & Hoag Co. (Newark, NJ) - Made by Boker USA circa 1900-1959
Wright & Wilhelmy (Omaha, NE) - Made by Boker and Ulster
1. Manhattan Cutlery Company (1868-1906).
2. Trenton Cutlery Company (1880-1906).
3. Regal Cutlery Company (1906).
4. George Dunbar (1901-1906).
5. Eclipse (1887-1918).
6. Hilton (1922-1924).
7. Edelweiss (1903).
8. Hardy Bros. (1884-1885).
9. Bicycle (1894).
10. O.K. Barlow Germany (1867-1917).
11. O.K. Barlow (1896-1917).
12. Red Injun Razors (1902).*
13. Celebrated Knife etched Bokers (late 1800's-early 1900's).
14. X (with an arrow thru it) Boker M R (1850-1875).
15. Baumwerk is Spanish for tree work.
16. Alemania is Spanish for Germany.
17. Radium (patented by Boker in 1904).
18. I'm not positive on these two, but I'm pretty sure Boker made them: W.D. Herbert and Dixon Cutlery Co.
19. Boker also made some knives for Case. The old Case radio or plier knives are identical to the old H. Bokers, as well as an old camp/scout knife pattern.
20. Prentiss Knife Co. New York (1916-1930) VF is stamped inside a circle (Valley Forge when Boker owned them) on the back of the tang.
21. Wyeth's Warranted Cutlery.
22. Bowen (1990's).