Hello again David
I contacted Dr Raban at Trinity Hall, Cambridge, but she could not help with Wymond, see below.
Dear Mr White
Your email reached me, but alas I'm afraid that I have nothing to tell
you. I have checked various indices without success. I also asked
Caroline Burt who has a substantial data base of middling knightly
officials. Equally sadly, but typically, he does not feature there
either. His name suggests either a Suffolk or Oxfordshire family,
perhaps the latter given Oxford Musuem's interest. Caroline did not work
on Oxfordshire, otherwise she might have been able to help. I suspect
that there is no alternative to trawling the Patent and Close Rolls and
perhaps looking at the Victoria County History for Oxfordshire. It
sounds a very nice, and rather unusual, piece belonging to someone who
was presumably not of the first rank.