Geymet & Alker Jumelle de Nicour

{"overview":"The Jumelle de Nicour is a 19th-century French detective camera made by Geymet & Alker, styled in the form of a binocular (jumelle) to disguise its purpose. A piece this scarce sells for whatever two determined collectors are willing to bid on the day, so the price any given example is worth can vary widely from this benchmark depending on completeness and provenance.","buying_guide":"Because so few examples reach the market, condition, originality of the bellows and optics, and documented provenance dominate value. Inspect the wooden body and leather covering for shrinkage and repairs, confirm both barrels and any internal plate-handling mechanism are present and unmolested, and treat any restoration as a significant deduction.

Generated summary, 30 Apr 2026 — not checked by hand; prices on this page come from the sales, not from this text.