The first one that comes to mind is their pattern #15, Boy's Knife. There are others but would need to check out the dealer pages first. Long pull narrows it down some.
Also....Pattern #99, Northfield Wall Street; #63 Northfield Mako; #65 Northfield Ben Hogan; #64 Northfield Swing Guard; #12 Northfield Toothpick; #28 Northfield French Kate; #48 Northfield Dog Leg Jack; Some of the #23 & #73's but they are Drop Points, not clips.