The Debrie Sept I is a French-made hand-cranked 35mm cine camera that doubled as a still camera, introduced in the 1920s. It was aimed at professional and advanced amateur use, combining motion-picture capture with a single-frame still mode on standard 35mm film.

At UK auction in 2026, hammer prices for the Sept I have clustered tightly, with recorded sales at £190 each and a median around £190 — this is the wholesale saleroom level rather than a dealer retail price. With only a pair of data points from October 2025, today's market value is best treated as indicative, and condition, completeness of the original case and accessories, and mechanical function will swing what a clean example is worth.