A rare 1812 map of Connecticut that served as a prototype for many 19th Century maps of the state will go on display Wednesday at Westport Town Hall, 110 Myrtle Ave.

A ceremony will be held at 11 a.m. outside the first-floor Town Clerk's Office to mark its unveiling.

The map, compiled by Moses Warren and George Gillet, is on loan from the Westport Historical Society, where it was part its 2010 exhibit "Putting Westport on the Map."

The map was donated to the Westport Historical Society by Westporter Carles Reedy and his family and restored under the direction of Robert Augustyn of Westport, a partner at the New York City-based rare map and book dealer, Martayan Lan Augustyn Inc. which donated the funding. A state grant paid for the framing.

In addition to Reedy and Augustyn, among those expected to attend the ceremony will be First Selectman Gordon Joseloff, a collector of Connecticut maps; Town Clerk Patricia Strauss; Dororthy Curran, president of the Westport Historical Society; Robert Weingarten of the society, who curated the map exhibit, and Susan Gold, society executive director.

The map includes Westport as part of Fairfield, Norwalk and Weston prior to the town's incorporation in 1835, and identifies the Green's Farms Parish area adjacent to Fairfield.

The map was found by Reedy about 10 years ago during site cleanup. Noting its age, he took it to the Westport Historical Society where it was later determined to be an original. Map experts said it is highly valued because it was based on a new and complete survey of the state by the two mapmakers and served as a prototype for Connecticut maps for much of the century.