Mystery Pots signed York, BC and FK mark - probably not Barbara Cass

Do people think this is the mark of Barbara Cass when she worked in York?
 (where Bill Ismay caught his studio pottery bug )

Looks like AC YORK, not BC YORK

I think you have to account for the likelihood it was written very quickly with a thick brush and the base is only 4 cm in diameter.

When I first picked up this brightly coloured vase ( YORK C : mark ) I thought it might have been a piece by Barbara Cass.
I am not sure who the mark belongs to, but I do think the same hand created both of these vases. The mark is a little different, but there are similarities and I think the K is lacking  (on the brightly coloured one) because of a lack of room.
Your thoughts are welcomed, thank you.

I’ve seen a few of the first one before; signed York, KC or CP or other monogram. I think it may have been a pottery co-operative.

The second one looks like John Froud’s ‘JAF’ monogram - Avago Farm Pottery, Huntington, York

Thank's Naomi, I was going to ask exactly what a co-operative would be, but I'll google it and educate myself a little.
I have never heard of that one before, many thanks, I'll have a dig

I guess it’s a collection of young potters using the same studio and making similar pots, like Chelsea Pottery, and Powdermills Pottery with their anagama kiln.
There are one or two currently in London... but their stuff is a bit hobby-potter-ish

Barbara Cass?

https://www.20thcenturyforum.com/t9948-barbara-cass

Cass’s York mark was a stamp according to the Marks book, not handwritten

Yes. I think I have, or have had, some of these York marked pots before,
probably from York boot!

I’ve split the questionable Barbara Cass pot, signed York, from that thread and merged it with this one.