So I bought this tiara from the UK on ebay a while ago - it was likely a link Kat posted (she is my favorite tiara enabler!). It was so pretty and it turned out to have an interesting provenance.
Here are pictures knicked from the ebay auction:
I emailed the seller to see if she knew about about and she told me this:
belongs to a neighbour who is a dairy farmer it has been in her family
for as long as she can remember and belonged to her grandmother that
would date it to around 1900 to 1920 it is silver plate on copper so
that would be around the correct date perhaps earlier that silver on
copper was used and also tortoiseshell.
She cannot remember anyone in the family wearing the Tiara,
she is in her late sixties. There was a time when the farming
community held regular farmers balls. And ladies used to dress up
really elegantly so the Tiara was most likely used for this.
I wore it for a Jane Austen ball.