The afro comb has long been associated with the 1970s, the accessory of a hairstyle that represented counter culture and civil rights during an important era for both. These days it makes a regular appearance on mainstream TV in America – the Roots drummer Questlove is fond of wearing one while performing as part of the house band on Late Night with Jimmy Fallon.

Forty years ago, the afro comb was worn in the hair not only as an adornment, but also as a political emblem and a signature of a collective identity. It was recognised as a way of saying no to oppression. Wearing the comb led to a kind of comradeship amongst those whose hair grows up and out, not down.

Previously, the Afro comb wasn't very visible. And for this reason it has been assumed that the afro comb was invented in the 1970s. But a new exhibition blows that myth out the water. The afro comb dates back to ancient Egypt. The oldest comb from the collection is 5,500 years old.

The hundreds of combs on display show that over time the style hasn't changed. The comb, sometimes called a pick, is commonly upright with long teeth. Sometimes a motif decorates the top. In ancient times it often referenced cultural belonging, and there are artifacts showing how people wore the comb in the hair. Time marches on and culture is always in transition. But perhaps not at the speed we assume.

Origins of the Afro Comb is on now at the Fitzwiliam Museum in Cambridge.