hi, yesterday a buddy at work brought in a bunch of schrade new in their box knives, like a kachina with sheath,folding hunter scrimshaws, a lonestar?i forget the name with beaded sheath a 507 scrimshaw with raccoons,plus a 51ot plus its box white cover sheath. my question is why are the 51ots bring a high price ,when were they made and ,2 how many are in the indian series,the names and if,i recall wasnt one of the indian series harder to find than the other ones,and what was its name.thanks for any info.He isnt a knife collector ,long story how he got them, but he wants more info on them than i can give him.thank you.p.s. these knives are as new in the box as you can get even with their white box covers.