Medieval coin - possibly Richard 1st ? with photos.

Hello everyone, I can't even remember where I got this coin but it is old. It might be Richard 1st but that's just a shot in the dark. Can anyone identify it and does it have any value?
 cheers. bill.
http://s1192.photobucket.com/user/victor-man/media/PC311340.jpg.html
http://i1192.photobucket.com/albums/aa326/victor-man/PC311340.jpg
http://s1192.photobucket.com/user/victor-man/media/PC311341.jpg.html
http://i1192.photobucket.com/albums/aa326/victor-man/PC311341.jpg

The numista catalog has a rather bad medieval English database.

Possibly a silver Groat from Henry VI?

https://en.numista.com/catalogue/pieces53811.htmla

It's definitely Henry, look here this should help you identify which type and possibly year.
http://www.ukdfd.co.uk/pages/edwardian-Pennies/Edwardian%20Pennies%20P1.htm

Hi, As far as I can tell its Henry VI , Calais mint , Rosette Mascle issue. 1427-30
if its 25mm its a groat. and if its 20mm its a halfgroat.
Value , about £100 for either. Nice coin.