R mark

Hi there, is this mark familiar to anyone?

The mark is familiar to me, but I can't get a lead for it sorry.

Sure looks like an R, but could it be AT?
(As it might appear with 90 degree rotation.)

Alternatively—thinking of the RK mark for Ross & Kay Palmer—could it perhaps even be DK, or even PK, stacked vertically.

I’m not saying it is not an R, just that there are other ways to view it.

Thanks to the Ferret who remembered Renate

https://www.newzealandpottery.net/t6698-renate-von-petersdorff-of-picton-made-this-bowl-and-dish#26524

Thank you! it’s a beautifully made piece