If internet rumour is anything to go by, I have a feeling the original cut was given to GHSC by Ingemar, then worked into seed form by Shanti.
After reading a spiteful, toxic message from Arjan addressed to Shanti, I personally have no doubt Shanti had much more to do with the strain, than he gets credit for.
I will try to find Arjan's message and post it here.
Rumour has it Shanti lost the cut in the GHSC breakup, but took all his own parent plants and cuts with him.
He has his own version called Black Widow over at Mr Nice.
If you're after something really similar to the original 90's Widow, Mr Nice might be a good option.
I haven't grown any Mr Nice myself. But for morality's sake, i'd give Mr Nice a try long before GHSC.
They're all regular seeds too.