The Olympus M-1 is a 35mm SLR introduced in 1972 as the original designation of what became the OM-1 after Leica objected to the "M" naming. Only a small number of M-1 bodies were produced before the rename, which is the main reason collectors treat it differently from the much more common OM-1.

Sales data for the M-1 is thin: a single UK auction hammer result from October 2024 sold for £106, which gives a reference point rather than a reliable range. Because that figure is a wholesale saleroom result rather than a retail price, what an M-1 is worth in 2026 in a dealer window or on a collector marketplace today can sit noticeably higher, and condition and completeness (correct M-1 engraved top plate, matching lens) materially affect what a clean example sells for.