Large slipware sgraffito jug, DjH mark

Hi
Ive had this for many years and never been able to identify it
Ive seen various similar pieces but never this mark
can anybody help

Not a mark I’ve come across before. I wonder if it’s an early piece by Lostwithiel Pottery

https://www.20thcenturyforum.com/t19064-john-webb-lostwithiel-cornwall

Hi Naomi
I can see the similarity in body and slip work but the similarity stops there.
You probably know there were/are a fair number of potteries turning out red body yellow glazed slipware
Their markings show no resemblance to my pot and that's why i posted here.
I have to say, I am surprised that nobody has even commented on this other than you. Does the site have many members and do items like this actually come up as new posts?
I haven't had any notifications of other peoples posts is that something to do with my settings?
You know with social media for example, every time a new post comes in you get a notification. this encourages you to view and then comment or delete.
Ive got a feeling Ive done something wrong here as I'm seeing nothing either about my piece or about other peoples posts.

regards
Jonny

Hi Jonny,
click on profile (under the forum logo) and set all your preferences

Hi Jonny,
I saw your pot no problem but didn’t have any ID in mind. Nice jug though.

I've seen a couple of similar pots, dark red clay and slip lizards and chameleons, and they were both Australian with circular inked stamps underneath. Can't remember specific makers, sorry.

I think it’s the same maker as this one, which appears to be a collaboration between a potter and decorator. Dated 1977, and the monogram IM.