11. A person cutting or breaking the coin under the provision of clause (a) of Article 10 shall observe the following procedure, namely:- (a) if the coin has been diminished in weight so to be more than such percentage below standard weight as may be prescribed as the limit of reasonable wear, but not more than such further percentage as may be prescribed in this behalf, he shall either return the pieces to the person tendering the coin, or, if the person so requests, shall receive and pay for the coin at such rates as may be prescribed in this behalf; and (b) if the coin has been diminished in weight so as to be more than such further percentage below standard weight so prescribed as aforesaid, he shall return the pieces to the person tendering the coin, who shall bear the loss caused by such cutting or breaking.