Quoting from "Levine's Guide To Knives And Their Values - 4th Edition" by Bernard Levine...
In 1883 John Chatillon & Sons Co. of New York City, a half-century old maker of scales, acquired the Foster Brothers Cutlery Co. of Fulton, New York, founded in 1878 by Frank and Allie Foster. Chatillon expanded the Foster Bros. line to over 500 items. During World War II Foster made 250,000 cleavers for the military, plus thousands of bolos and other knives. Chatillon closed Foster Bros. in the 1950's, and sold the name to the Columbia Cutlery Co.
Quoting "Goins' Encyclopedia of Cutlery Markings" by John & Charlotte Goins...
Foster Bros. & Chatillon Co.
c. 1835 - present
John Chatillon Company made scales when it was founded in 1835. Eventually, they began making butcher knives, cleavers, and steels. In 1885, they became sole agents agents for the Foster Brothers line butchers' tools.
In 1896, the firm purchased the Phoenix Knife Company of Phoenix, New York. They then merged it with the Foster Brothers & Chatillon Company. This added hundreds of patterns of of jack and pen knives to their line.
They continued dealing in pocket cutlery as late as 1937. The firm is still in business, dealing in butchers supplies.
If you want to know more specific information, such as the possible date of production, then you would want to scroll down the forum list and re-post in Bernard Levine's Identification forum.
*Note - Mr. Levine can likely (only) help you if you have some good images of the whole knife/cleaver as well as of any identification marks. He will not value a knife unless you request him to do so through his website. He gets paid for this service.
*Another note - If you're at all interested in their value, be it monetary or historical, then please refrain from cleaning or sharpening this knife until it's been appropriately identified.
Good luck with your hunt...