What year was a Iver Johnson trailsman 66 serial number k7876?

The Iver Johnson Trailsman 66 with the serial number K7876 was manufactured in the early 1970s. Specifically, Iver Johnson produced the Trailsman series from 1971 until 1978, and the serial number indicates it likely falls within that range. For precise dating, further information or a detailed serial number chart from the manufacturer would be needed.