The Hammer was an automobile built in Detroit, Michigan

Detroit, Michigan

Detroit is the major city among the primary cultural, financial, and transportation centers in the Metro Detroit area, a region of 5.2 million people. As the seat of Wayne County, the city of Detroit is the largest city in the U.S. state of Michigan and serves as a major port on the Detroit River...

 by the Hammer Motor Company from 1905-06. The Hammer was a light car built with a two-cylinder, 12 hp engine in 1905. This was replaced with a 24 hp, four-cylinder engine for 1906. The five-seater tonneau weighted 1,800 lbs, and came with a choice of a planetary or sliding-gear transmission, with a shaft final drive. The Hammer Motor Company was formed as part of the Hammer-Sommer

Hammer-Sommer

The Hammer-Sommer was an automobile built in Detroit, Michigan by the Hammer-Sommer Auto Carriage Company Ltd. from 1902-04. The Hammer-Sommer came only as a five-seater, detachable tonneau model. The vehicle came equipped with a 12 hp opposed two-cylinder engine, mounted beneath the body, and...

when they became defunct in 1905.