This reinsurance contract may be cancelled at any time by either the Reassured or Underwriters by tendering 90 days notice in writing in respect of Marine Risks or 7 days in respect of War, Strikes, Riots and Civil Commotion Risks, except in the case of sendings to and/or from the United States of America which shall be subject to 48 hours Notice of Cancellation at any time.
Such notice, however, shall not apply to any risks which shall have commenced or been declared prior to the termination of the period of notice.