They may have been a custom shop option back in the day (before my time) when you could get just about anything you wanted from the custom shop. The stag 119 and all the others I've seen are Limited Editions, not true customs.
Here's CJ's answer regarding the sheath:
#10 06-04-2009, 07:47 AM
CJ Buck
Moderator Join Date: Apr 1999
Location: Post Falls, Idaho
Posts: 866
The guy who designed those was Wes Chapman. He worked for our leather department and was an artist in leather and could make frameable pictures in leather. Really really talented.
I am pretty sure those were designed for the custom shop so we were not sending out custom knives with factory sheaths and then got added to the line as an option.
__________________
CJ Buck
Buck Knives, Inc.
AKTI Member #PR00003
I have several of the sheaths and have plain everyday knives in them so having one in a sheath like that (I've bought them like that) doesn't mean it's a custom knife unfortunatly.