Hi Sue,
Thank you for your response. I have just had a look at Ivo's mug - it doesn't seem to be like that - its been done on a blowing iron and Ivo's has no pontil mark.

The facial features on my one are really well tooled and balanced. Each eye is made up of 3 separate bits (upper, lower and eyeball).
I know some modern Italian vases have applied facial features but these are quite unbalanced and in bright colours unlike mine.
To me, it does have the feel and look of maybe as early as Victorian crackle glass but I suppose it could be even 1950/60's. There is significant wear around the base.

J