2610. Where the whole or any part of the goods or other movable property insured has been delivered damaged at its destination, the measure of indemnity is such proportion of the sum fixed or, as the case may be, of the insurable value, as the difference between the gross sound and damaged values bears to the gross sound value.
“Gross value” means the wholesale price at destination or, if there is no such price, the estimated value of the property with, in either case, freight, landing charges and duty paid beforehand or, in the case of goods customarily sold in bond, the bonded price.