This has a distinctive flipper It's more of a swiping action, (You Have to feel it) the kershaw leek pretty much took the place of this knife almost all of the knives released at this time were manual knives. spring assist had yet to catch on most people prefered Manual at this time.

Kershaw Overdrive 1775
Link: https://www.youtube.com/watch?v=EkkGJsNtjgU