Thanks FF, wondering who are the parents.
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Sorry, I'm not sure about the myth or the parents, though I suspect it descends from pure Afghani genes. According to the "story", the stolen cut tested above 28% THC; which seems to imply F1 status, to me; or possibly F2. Based on that test, though, and the story attached to it, it was the most potent indica known, at that time.
So, since it was clone only, it had to be out-crossed and inbred to IBL status, to preserve the genetics. It's difficult to speculate, if not impossible, about how many cuts were distributed in the USA before Nevil got his.
In the podcast interview with Shantibaba, posted on the forum recently, he attempts to address the issue / problem about how different plants on the market are sometimes known & sold under the same "trademark" name, but appear dissimilar.
It has to do with the breeding process that involves individualized breeder selection; but then still calling it by the same name, rather than rename it, after all that work, if it looks little or nothing like its original parent(s).
Not being a breeder myself, it's something better explained by Shantibaba than I; but, I seem to recall him discussing that topic, in the podcast, in connection with the different Hazes & Skunks that Nevil had access to, and worked with in the '80s, along with the SS & RC Clarke; some of which still survives as 40 year old seed stock; if I understood correctly.
I recall Shantibaba saying there was great variety or variability among the Hazes back then; but they were called "hazes". I think I recall him saying it was possible, back then, to fill a room with a hundred different plants, all of which were all "hazes", technically.
So, selections had to be made; and he said that Neville's selections were uniquely his own, and those by Watson & Clarke were uniquely their's. Shanti said that he & Nevil would make different Haze selections, based on different criteria. He said they had a different morphology that is still visible or detectable today, in the MNS genetics.
Anyway, It sounded to me like Nevil, Clarke and Watson worked closely, or collaborated on some breeding projects, for a short period; until it all fell apart when the 'Green Merchant' bomb dropped.
That ended their joint breeding projects and those common strains which were already branded as "Haze" and "Skunk1", along with other strains, developed in different directions, from that point on, based on individualized breeder selections.
In terms of pheno hunting ability, Shantibaba said that Nevil was the real gene chaser among those three; and had the most influence on their development, producing superior versions of the Haze & Skunk1. Maybe I imagined it, but I thought I heard Shantibaba say that Clarke had a Skunk1 phenotype that made killer outdoor hash; which really impressed him.
So, why am I saying that anyway? Because in "theory" three different breeders, in the '80s, could have each obtained a G13 cut, out-crossed and back-crossed it 4 times, and ended up with 3 different looking versions of G13, based on the selection skill(s); but all 3 are legitimately called G13 if all the female selections were highly G13 dominant, selected for looking the most like the Original cut.
So, anyway, I personally have zero doubt that Nevil possessed the real G13, and worked it well, until it was lost; and I have zero doubt that Shantibaba obtained an authentic G13 replacement. You are getting the real deal from MNS. That's not at all to say it's the only version of G13 out there; but there aren't many and it's not so easy to find it as an IBL in regular seed.
Cheers! - FF