Petra Tilly

Hi,
New to the site, and was wondering if someone could give me any advice with regards to a piece that I purchased a few years ago.
It's a square platter/plate by Petra Tilly ( markings on back state Petra T "freesia").
I paid a 3 figure amount for it around 5 years ago from a small tea rooms in the Devon area, and am wondering if it's worth me trying to sell it on now, or keep it under wraps for a few more years.
Ta
Mandy xx

Petra still commands 3 figure sums for her one off pieces,perhaps you could post pics of your plate including the markings on the back