I have a scarce 1/4 real of 10 soldos to swap:
https://en.numista.com/catalogue/pieces39995.html
(Bottom reference)
I appraise it at 50€, I am looking for about equal value in a swap. My first interests would be Spanish medieval coins and secondly Italian/French medieval coins, especially if minted under the crown of Aragón. If you have other stuff that may also be interesting don't be afraid to shoot me a message!
Benny