The Leica Winder M4-2 attaches to compatible Leica M cameras and makes them loud. Serial 15868, so this one has a maximum of 3fps advance. In excellentcosmetic condition overall, with a bit of a waxy texture to the leatherette, very minorsurface wear from lightuse and handling. Includes box. Works, but these have a reputation for being a bit rough on cameras, so use at your own risk.