The ashlar granite Italianate house at 5 The Green in Watertown was erected in 1851 by Truman A. Warren. He was the son of Alanson Warren, of the manufacturing firm of Warren, Wheeler & Woodruff. Alanson Warren was also the first president of a company that grew out of that firm: Wheeler & Wilson, manufacturers of sewing machines. Truman A. Warren was a Republican politician. The house has been attributed to New Haven architect Henry Austin or it may have been designed by an architect copying Austin’s style of Italianate villa.
Truman A. Warren House (1851)
Interesting that the cupola is virtually identical to the one on William H. Perry’s house in Bridgeport:
https://historicbuildingsct.com/?p=11526
Interesting comparison! And both houses were connected with Wheeler & Wilson!
I kind of doubt it is Austin. The materials are not his style, the arched cupola is more like a Norwich feature than anything, the columns and massing are really not reflective of his creativity, and the detailing is a bit too classical.