Rhode Island Tercentenary Issue First Day Cover
300th Anniversary of the Settlement of Rhode Island
Issued on May 4, 1936 in Providence, RI - Scott #777

Unofficial Town Cancel - Oak Lawn, RI
Rhode Island Tercentenary Commission - Planty #777-18c

The Oak Lawn Post Office, (Cranston Township, Providence County) was established on May 3, 1871 under Postmaster William Elsbree. The Post Office was disestablished on February 28, 1958. During the first three months of its operation this Post Office was known as State Farm, (March 29-May 3, 1871).

Sources:
Check List of Rhode Island Post Offices 1790-1994 - Del Beaudreau
Rhode Island Postal History: The Post Offices - Merolla, Jackson & Crowther