This insurance is on increased value of cargo by reason of payment of customs duty at the port or place of destination and is subject to the same clauses and conditions as the primary insurance of the cargo and to pay the same percentage of the duty payable (excluding charges and expenses) as may be paid thereon but excluding claims in respect of Total Loss or total loss of part cargo or General Average contributions an salvage charges arising prior to duty becoming payable. Credit shall be given for any rebate or refunds of duty which may become allowable. It is warranted that (i) This policy is not assignable (ii) No claim unless the claim under primary Marine policy is payable and proof of liability for loss to be submitted. (iii) This is not a valued policy as defined in the Marine Insurance Act, 1963. Claims under this policy are payable on the basis of actual duty paid or on the basis of sum insured, whichever is less. (iv) In the event of a claim, immediate notice of loss to be given to Insurer and a reasonable opportunity is to be given to the insurer to survey an assess the loss.