Many would agree that this is Ching Shui Ni clay. Pot size about 120ml
For Zisha, actually there is no absolute but a probably range of type of clays. Those absolute fancy clay names are to lure collectors. The same clay have different appearance under different firing temperatures. Unless those clay are carefully separated when they are mined from Huang Loong Shan according to the strata then it would be more accurate. In reality when mining everything are dug out and mixed and cart to the factory to make teapots. Maybe clay like Shi Huang Ni which is embedded in the gap of boulders would be purer but they still appear different under various firing temperature. Of course there are connossiers and masters of Zisha who are expert in producing purer types but realistically it is still a smaller range.
So, I would say the clay it is authentic zisha from 1979, pot produced in Yixing in Ching Shui Ni clay.
It is really a big complicated world of Zhisha out there.