Jigged/molded synthetics or Delrin are quite easy to distinguish in person. I have seen auction site adds where the knife is advertised as "jigged bone" but is clearly jigged Delrin.
Older Case knives with brown Delrin actually look a lot like a deeply dyed bone, even down to the pits from the jigging being a darker color. I think they may have actually used a jigging process on smooth sheets of Delrin rather than pre-molding them with the jigging built in. After you have seen or handled one of these, you'll be able to spot them without much problem, even in pictures. The newer ones are pretty obviously molded.
It doesn't help much that Case's pattern numbering does not distinguish between jigged Delrin and jigged/smooth bone, and jigged laminated wood. All of those start with a "6", so you can't use that to differentiate.
Bone stag, stag bone, stag carved bone, etc are all cow bone made to resemble stag (deer antlers). Staglon was Uncle Henry/Schrade's name for the molded plastic handles made to look like stag. So whenever you see the word "bone" in there with stag, it's not stag.
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