The Sunbeam Mixmaster 175W (specifically models like the MMB) was primarily manufactured in the United States between 1968 and 1974. These 12-speed stand mixers are known for their chrome finish, detachable motor head for hand mixing, and 175-watt motor. 

Key Details About This Era:

• Production Years: 1968–1974.

• Key Features: 12-speed Mix-finder dial, detachable motor for handheld use.

• Model Numbers: Commonly the MMB model, though 175-watt models existed in the mid-to-late 1960s as well.

• Design: Chrome, white, or various colors, often with black handles. 

The 175-watt motor became a standard feature during the height of the mid-century modern, countertop mixer era