I still have a few packs of Calizahr lying around.
Pulled straight from a High Times article where Crockett is HT's host at his farm. He clearly states that Tangie is made from 200 "Orange Velvet" seeds he got from the PNW. AKA, Agent Orange from Subcool.
https://www.hightimes.com/read/sensi-sierras-0
He says he crossed it with "Candy Jack"... Considering I don't remember any pure Orange Velvet (remember this is the Melvin clone renamed) seeds sold in mass, and AO is (Orange Velvet x JTR male) I would wager a guess that Tangie is just some AO F2's... WOOOORRRDDD UP!!!