Does Anyone Know Incised Mark On This Studio Pottery

I have about 7 pieces of studio pottery all have this incised mark, some are dated 70,, to me the mark looks like a lower case n over h ???

Not a mark I've come across before. In my experience, a job lot of studio pottery with the same mark means a hobby potter or their family is having a clear out.

The crudeness of the incision marks and what looks some of the faults with the glazing probably indicates Student pieces. Pottery making was hugely popular Alternative lifestyle in the 70's and a very large number of people started it. But it was a difficult way to make a living.