Thank you - well spotted! It is a refurbished oil lamp holder - I have a couple of them. I cleaned them up and hang them high up out of chicken reach and put a cup of scratch grain on them. That way if I am ever desperate to get the chickens in or out I have a bribe ready to hand. They know the sound of the grain rattling in the tin mug.Nice cup holder!
I placed the two holders strategically by the door to the chicken garden and the door to my chicken free storage so I can get them in or out if I have to!