Grogged ceramic vase marked CRANK A7(T) SPY?

Hi folks,

Can anyone make sense of this very tactile vase?

I have a feeling it might be a test firing owing to the 'marks' underneath.

CRANK ... isn't that a specific grogged clay?
The bracketed T ... could that mean 'T Material'?
... And is it SPY or 5PY?
As to who made it ... I have no idea ... I bought in the UK ... but IS it English?

5.5" high ... 6" diameter.

Any clues will be appreciated ... Thanks!

Yes, Crank is the name of a specific type of grogged clay, so most likely it’s a glaze test piece.

agreed