The Shawmut Motor Company was organized in Stoneham, Massachusetts in 1905 to succeed the Phelps automobile.

[2] For 1906, the first Shawmut was the Model 6, a luxury automobile with a four-cylinder 40-hp touring car body costing $4,750, equivalent to $161,078 in 2023.

[3][4] From 1907, a less expensive Roundabout (short wheelbase touring car with no doors) model was produced for $3,500, equivalent to $114,450 in 2023.

For 1907 Shawmuts were designated Models A, B, C and D, representing roadster, touring, limousine and landaulet body styles, priced from $4,750 to $6,500, equivalent to $212,550 in 2023.

[2] All body styles were made with sheet aluminum by Boston's premier coachbuilder, Chauncy Thomas & Company.

[10] In October 1907 two Shawmuts participated in the Bay State Endurance Run, driven by Arthur Ayers and Harold Church.