Hi All... I am aquiring this for my dad for christmas, who is 87 and ex wellington bomber crew BOMB SIGHT & RELAY-SWITCH FROM WELLINGTON BOMBER..help needed please ,anyway point being he isnt sure if he wants it when I get it ,yes I know the answer is dont get it ,but he,s 87 so I,ve got to give him the choice !! ,could any-one tell me what its worth and possibly where best to sell it please .I hope I have done all this correct as it is my first time on here