(1) Where the consideration or any part of the consideration for which any lease is granted or agreed to be granted does not consist of money, but consists of any produce or other goods, the value of such produce or goods is to be deemed a consideration in respect of which the lease or agreement is chargeable with ad valorem duty. And where it is stipulated that the value of such produce or goods is to amount at least to, or is not to exceed a given sum, or where the lessee is specially charged with, or has the option of paying after, any permanent rate of conversion, the value of such produce or goods is, for the purpose of assessing the ad valorem duty, to be estimated at such given sum or according to such permanent rate.

(2) A lease or agreement for a lease made either entirely or partially for any such consideration, if it contains a statement of the value of such consideration, and is stamped in accordance with such statement, is, so far as regards the subject matter of such statement, to be deemed duly stamped, unless or until it is otherwise shown that such statement is incorrect, and that it is in fact not duly stamped.