according to the book hashish, afghani hash of 1971 and prior was the dragon and folks have been chasing it ever since. if I am understanding Clark's writings on the subject it would seem that after 1975 there were several very organized groups that created the worlds export hash market and with the chasing of the pre 1972 afghan sticky, and during the crackdowns in Afghanistan, the hash smugglers moved on to Pakistan, Nepal, morocco ect. often "nepali" hash was a blend of hashes from Pakistan ect , all with the goal of chasing the dragon that was the pre 72 afghan sticky.
Opiums were mixed in for this very reason, trying to create the very best hashish, again , chasing that afghan dragon. Nepali hash, in the export records clark details in his book , which end in the 90's show nepali hash as Black temple balls or fingers. He also shows it wasn't always of good quality but when it was it was outstanding.
Afghan black , exported in various quality and with varying seals and containments were exported to north America in large amounts into the 90's. I belive this is the hash that we got here called Gold seal and also the romeo and Juliet. There was also a thriving Jamaican hash market but I won't get in to that.
Now, after typing all that, bear in mind, I am just regurgitating from clark's book to the best of my understanding.