Celtic Coin ?

I have a small Celtic coin I think that I bought along with another that is a Silver Unit of Corieltauvian v 55bc-45bc from an antique fare some years ago its 14mm approx. in Diameter and 1.9mm thick made of Silver with a profile face on one side and a horse on the other. Is there anybody who has a knowledge of Celtic coinage I have been searching for a while but have drawn a blank so far help would be very much appreciated as my knowledge of Early English Coinage is very limited but I am improving very slowly. Thank you in Advance.

very nice coin!!
perhaps you can find some info here:
https://www.mediafire.com/folder/i97y9dhius1vp/Books

Thank you for the links I have Spinks Coins of England 41st and 42nd Editions but have not found the Coin yet I did manage to Identify the other coin I have it is a silver unit corieltauvian 55bc to 45bc sp#396


Below is another Site that is Very good for Celtic Coins but alas no luck there either I will keep Hunting as that's a big part of Coin Collecting finding out where a Coin comes from and its age.

https://vanarsdellcelticcoinageofbritain.com/plates-catalog-listings_ccb3/plate_280_ccb3.html

Ian.