A watchmaker's magnifying glass (1) comprises a body (2) whose side wall (5) surrounds and defines an axial passage (4) for the light, and a lens (3) mounted across the axial passage (4). ). The body (2) is deformable so that it can be flattened from a use configuration, in which the axial passage (4) extends in an axial direction, down to a space-saving configuration, in which the watchmaker's magnifier has a smaller footprint in the axial direction than in the use configuration.
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