The BladeMaster has documented eighty-one Colt and Case pocket knives on KnifeDB.com.  The first was made in 1981, and the last in 2015, which is as far as I have gotten.  14 of the 81 are stag.  These begin in 1989 and the last one currently seen is from 2014.  You can see all the details by going to Knife Search-opening Special Collector Searches-Clicking the Brands Drop Down, Select Colt Firearms-Search.  Here are a few of the 14 stags.  The knives on KnifeDB.com show actual selling prices for collectors.