I've been potting!!! Slab Vase With Poss TC / JC

Quite large, 22cm tall x 18cm wide x 5.5cm deep. Swirl design on both sides. Troika - like.  It looks possible that there is a mark on the base, incised but not very deep, almost written on (it won't rub off...I've tried).
I think it may be TC or JC?
I've looked in the book and all the possibles like Jean Cunion don't have much on the web to find. Can anyone help with this dubious id.