Studio jam pot, stripes and incised line decoration, marked

Studio jam pot, stripes and incised line decoration, marked
Impressed mark, possibly TH / HT or a lines symbol
Similar but not the same mark in book.
Well made

Thanks Naomi. So many more marks I do really need to know! And I need to get better at using the book and finding my way round it! Seems like his work is fairly uncommon tho’ there’s a preserve pot exactly the same as this one on eBay atm. Thanks again.