I was 99% certain it was Medieval, mind you I did consider late Saxon as well, but rather than guess (like some) I confirmed the date, and knew this would lead you to what it was used for.Hey, both of you guys, spot on!!
I could not find anything at PAS; sure that its there but its difficult to search without knowing a few good search words I guess.
Did not think about ukdfd, stupid that I did not also look there (even though I could have missed it there too!).
Thanks Cru and SS for your help and determination, I think you both had it correct!
Now wondering how it was used, and what the small bumps or knobs were used for. Will go searching.
Earl