Used condition - see pics for marks/rubs on plastic body through use. The instructions say the Leica SF 20 flashgun was specifically developed for the Leica R8 and Leica M6 TTL models fitted with Through-The-Lens flash exposure metering. It further says in conjunction with the corresponding contacts in the foot of the Leica SF 20, the additional contacts in the camera’s accessory shoe not only permit camera-controlled flash illumination, but also automatic transmission of a number of data and settings between the camera’s accessory shoe and the flashgun for the convenience of the user.