Boyce MotoMeter Universal Model Value Guide

The Boyce MotoMeter Universal Model is a quintessential early 20th-century automotive accessory that served as a vital external temperature gauge before dashboard instruments were standard. Invented by Harrison H. Boyce, these brass and mercury devices are highly collectible for their functional history and their status as an iconic symbol of the brass era of motoring.

What affects the value of Boyce MotoMeter Universal Model?

• Condition of the internal mercury tube, as a broken or separated thermometer significantly reduces the $100 market value.
• Clarity of the glass lenses; clouding or deep scratches can detract from the item's display quality.
• Presence of original mounting hardware or a period-correct radiator cap which increases desirability for restorers.
• The patina of the brass finish, where original unpolished surfaces are often preferred over over-cleaned examples.

How to Identify Boyce MotoMeter Universal Model?

• Verify the 'Universal Model' branding etched on the circular brass faceplate surrounding the glass tube.
• Check for the original mercury-filled glass thermometer which should be intact and visible through the front and rear lenses.
• Look for the manufacturer's mark of 'The Moto-Meter Company, Inc. Long Island City, N.Y.' on the dial.
• Confirm the construction materials are authentic brass and glass rather than modern plated plastic reproductions.

History of Boyce MotoMeter Universal Model

The Boyce MotoMeter was an essential accessory for automobiles in the early 20th century. Before reliable dashboard gauges, this device provided drivers with a crucial visual warning of engine overheating by indicating the temperature of the radiator coolant. Invented by Harrison H. Boyce and manufactured by The Moto-Meter Company, Inc., it was a prevalent sight on vehicles from the 1910s to the 1930s, becoming an iconic symbol of early motoring.