Looking at a knife collecting guide* I sometimes refer to, it shows Case carried the '3138' pattern in the 1982-1988 time frame (don't see any yellow soddies listed prior to 1982, either large or small), then apparently discontinued it around 1989. For that year, the guide lists it as '3138 Disc' (I'm assuming 'Disc' means 'Discontinued'), and includes the same 'Disc' suffix for all '38-pattern large soddies, in fact, in both yellow and black (3138, 3138 SS, 2138, 2138 SS). It then lists the black-handled 2138 and 2138 SS quickly coming back in 1990, but not the yellow 3138 or 3138 SS. The large yellow soddie is absent from the listings through 2000 (at least). That's as recent as my guide gets.
I have a couple of 3138 CV in a 2006 date stamp, and even those appear to have been a short run, until now.
* = Parker Knife Trader's Price Guide, Volume 8; James 'Buzz' Parker/Ed Henley (2007)
David