1970's vase, with incised signature.

I purchased this piece some time ago, but have never displayed it as my partner loathes it. I do not like the glaze either



, but I found it an interesting shape. If anyone can shed light upon the maker it will be much appreciated.
Incised 1976 and the letters T H L****, I cannot make out the last name.

is it porcelain ?

No, not porcelain. It is a heavy old lump of something Dan, I am not sure what.

looks like porcelain it can be as heavy as any other clay

it's far heavier than earthenware

Sorry, excuse my lack of knowledge, I was judging by the weight, I thought porcelain was lighter than earthenware.
I think I need to spend a little time educating myself about such matters, I have often struggled to identify the actual material and can safely now say that I know less than I thought I knew before, lol.

A porcelain tea-cup is always lighter than an earthenware one, as it can be made much
thinner, as it is a stronger material.

Thank you Denby
So a stronger material, which from my understanding means it must have a greater density than anything else that is crafted and fired?
But what about colour, is this the biggest tell tale of the above vase being porcelain, because the unglazed foot is white? Or is there something else I am missing?

the porcelain clay is extremely dense and the molecules being tightly bonded makes for very strong clay bodies that can be thrown very finely into tableware etc  but thickly pottered porcelain is as heavy as pottery gets.
Colourwise porcelain is white but can have a turquoise tint to it when fired

But of course, just to throw a spanner in the works, stoneware, which is
always heavy, can be very pale and fine.

Thank you Dan & Denby.
I am slowly learning