**Document Title:**

This document appears to be an insurance policy endorsement form, specifically related to Zurich Insurance and American Guaranty & Liability Insurance Company.

**Key Information:**

- **Policy Number:** 88 26 230
- **Effective Date (Eff.)**:
- **Endorsement Number:** End #19
- **Named Insured:** National Business Machines Corp.
- **Agency Number:** 50-515
- **Additional Premium:** $0
- **Endorsement Date:** 1-1-76

**Endorsement Details:**

The endorsement is issued for the policy stated in the policy described above. It mentions that the company designated below is the insurer under the above-numbered policy and forms part of said policy as of the effective date hereof at the hour of issue.

**Conditions:**

In consideration of the premium charged, it is understood and agreed that:

- Any or material change affecting the interest of the insured shall be given written notice to the department of the Army, United States Government, 10 days prior to the effective date of such change.

**Signatures:**

- **Johnson & Higgins**
- **Date:** 12-7-76

**Additional Notes:**

The document includes a section for Zurich Insurance and American Guaranty & Liability Insurance Company, with signatures and a note indicating that the endorsements are for property, automobile, burglary, and other coverage and compensation policies.

**Endorsement Purpose:**

The purpose of this endorsement is likely to modify or add coverage to the existing policy for National Business Machines Corp., as specified by the named insured.