If any Increased Value insurance is effected by the Assured on the cargo insured herein the agreed value of the cargo shall be deemed to be increased to the total amount insured under this insurance and all Increased Value insurances covering the loss, and liability under this insurance shall be in such proportion as the sum insured herein bears to such total amount insured.
In the event of claim the Assured shall provide the Underwriters with evidence of the amount insured under all other insurance.