Any purchaser of edible nuts which are delivered pursuant to a contract entered into on or after the effective date of the act amending this section in the 1983–84 Regular Session of the Legislature and which is in violation of this article is liable to the seller for the reasonable value of the nuts as of the time of delivery and, in addition, is liable to the seller for a penalty of twice the difference between any amounts paid to the seller and the reasonable value of the nuts at the time of delivery. Any purchaser of edible nuts which are delivered pursuant to a contract that was entered into prior to the effective date of the act amending this section in the 1983–84 session which is in violation of this article is liable to the seller for the reasonable value of the nuts as of the time of delivery and, in addition, is liable to the seller for a penalty of twice the reasonable value of the nuts.