A rare collection of Swatch timepieces which traces the beginnings of the Swiss brand more than three decades ago will be auctioned in Geneva in November, Sotheby’s said Friday.

The collection, which will go under the hammer on November 10, comprises around a thousand watches, among them 380 prototypes with an estimated value of over a million Swiss francs (900,000 euros, $1 million). The collection was put together by Marlyse Schmid and Bernard Muller, two designers who worked on the brand in the early 1980s before its launch.

Swatch, best known for its brightly coloured plastic-cased watches, is considered the product which saved the Swiss watch industry during the 1908s. At the time, Swiss watches were hard hit by the emergence of Asian-made quartz timepieces.

It was in this context that a small team began to work in secret to develop a bold and innovative Swiss watch in a new and creative style, Sotheby’s said. Among the top lots is the original Jelly Fish — the first transparent watch dating back to 1983.