The Newman & Guardia Sibyl Excelsior is a British-made folding plate camera from the early twentieth century, part of the Sibyl family produced by the London firm Newman & Guardia. It was positioned as a compact hand camera for serious amateur and professional use on glass plates and cut film.

UK auction hammer results for the Sibyl Excelsior are thin, with only two recorded sales in recent years at £175 and £188 — a tight range around the £180 mark at saleroom level, excluding buyer's premium. As of 2026, what a Sibyl Excelsior is worth today depends heavily on cosmetic condition, completeness of the leather case and plate holders, and whether the shutter is still functional, with clean working examples sitting at the upper end of that range and incomplete bodies selling for less.