With the help of my iKC friends and Steve P., a 3rd generation Colonial knife family member, we identified this knife as a Colonial CY-13 lock back folder, an American made knife with 1075 high carbon U.S. steel. The smallest of the "Coyote" series, the tang stamp was changed from "Coyote" to "Colonial" in the early 1980's.

Spec’s:
Overall Length: 3” closed; 5.25” open
Blade Length: 2.25”
Blade: Clip point; 1075 high carbon steel
Handle: Delrin-type material w/four brass pins
Bolsters: Brass
Weight: 3 oz.
Orig. UPC: 00013-CP, 00113-GB

This knife sold in November of 2015 for $25.00.