Winchcombe Pottery

I do not think it is Elijah Comfort or Michael Cardew. That bottom is rather messy and both were professional potters. It has the feel of an apprentice piece. In that case the overwhelmingly likely maker would be Sidney Tustin who joined Winchcombe pottery in 1927 and was apprenticed to Michael Cardew 1930-34. He was a stalwart of Winchcombe pottery and worked there until 1979. As an early Sid Tustin piece, I can see people keeping it in their collection.
Other possible but probably less likely, are Sid's brother Charlie Tustin who joined Winchcombe in 1935. Another outside possibility would be Ray Finch himself who worked at Winchcombe from 1936.
The clay is unusual, as generally Winchcombe used a darker red earthenware clay.
If you are interested in Winchcombe the best book on it is WINCHCOMBE POTTERY by Ron Wheeler, from which most of the into above is taken.

Its an interesting piece. But it is a bit like pre-war St Ives earthenware pieces. Unless they have a personal mark, the maker is always guessing work by style and form. Hence this probably being an apprentice piece. Because of its style and faults it is not a perfect professional piece, and would probably not have been sold at Winchcombe. More likely to have been kept as a souvenir by a developing apprentice. Hence its survival, which is rare.

You might find the threads we have on here interesting about Winchcombe, Worth a browse. There is a lot on interesting information around. Put Wicncombe, Tustin or Finch in the search box.
This is the main Winchcombe thread.
https://www.20thcenturyforum.com/t7608-winchcombe-pottery?highlight=winchcombe

You might also like to have a look at Ebay under Winchcombe pottery. There are always a load of pieces on there from various eras

It is now quite old. They stopped making earthenware in the mid 1960's.Interesting slip trailed design as well.

The short answer is No,as to who made it. It was a production pottery, and the whole idea of the standard ware range was uniformity. You could buy individual pieces again and again and be sure they would be exactly alike.
Moreover the mark used was one used for nigh on twenty years, when Winchcombe pottery was at peak sales. Cranks the famed vegetarian restaurant used their standard ware and it was very popular!

The same type of piece is still available in their present day range.With slight differences. The cost of £35 being the main one!
https://www.winchcombepottery.co.uk/the-range

You might find this link helpful
https://www.20thcenturyforum.com/t3971-how-to-upload-photos-to-your-posts