This document appears to be an endorsement or addendum to an insurance policy, specifically for International Business Machines Corp., dated 5/21/73. It is part of Policy No. CR-9154-030 and is issued by the Commercial Union Insurance Company.

The text states that if the aggregate limit or limits designated in the underlying policy or policies are reduced or exhausted due to payment of losses in respect to accidents or occurrences during the period of such underlying policy or policies, then the insurance afforded by this policy shall apply in excess of the reduced underlying limit. If the underlying limit is exhausted, the insurance from this policy shall apply as underlying insurance, notwithstanding anything to the contrary in the terms and conditions of this policy.

The document is countersigned by an authorized representative on 7/23/73.