D 21 impressed 83

Hmmm I see D 29 then a line ....?
Can you check this one out please Tony

In the flesh the 9 you see looks like a 1 with curves to the left at top and bottom - a reversed C. It is underlined as if a partially finished fraction. This mark seems to be inscribed into the glaze rarther than the clay body.

Ok I will go with what you see Tony.
All of my fraction marks are marked through the glaze Tony.
Do you have any that are marked into the clay?

Running a fingernail over the numbers on the bases of the pieces with clear glaze gives the sensation that there's an indentation in the clay body. The numbers have glaze in them. Once I made this assumption I kept on thinking that the numbers were inscribed in the clay body and the clear glaze applied over the top. Now thinking about it in a more considered fashion it seems equally possible that the numbers were inscribed into the applied clear glaze after it had dried. As it fired the inscriptions will have softened as the glass formed.

Ev your potter's eye continues to see things that my amateur ones do not.