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 - Washington, RI
1st Rhode Island Tercentenary Commission - Planty 777-18

The Washington Post Office, (Coventry Township, Kent County) was first established as the Coventry Post Office on January 19, 1827 under Postmaster Oliver G. Wilbur. The name of the Post Office was changed to Washington on February 27, 1883 under Postmaster Walter A. Kilton. The name was changed back to Coventry on November 1, 1951.

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