Leica Mooly Motor The Mooly Motors were the natural progression from the Leica Rapido & Rapid Winders.  They were clockwork style motors that were wound-up with a key placed on the bottom of the motor.  A complete winding would allow you to take 12 photos in rapid fire succession. A total of approx. 5300 Mooly Motors were manufactured.  The first 1000 had a two speed switch on the front of the motor and an external shutter release linkage.  Later models omitted the two speed feature and had an internal linkage to the shutter release, about 4000 of these were manufactured.  Later the Mooly-C was released for attachment to the IIIc, it was longer than the previous model and only approx. 300 units were manufactured.  Some of these were 'K' model SN# that were produced for Wartime Leica's. The Serial Number is located on the front of the Motor.  Not many were produced or survived the years since they were introduced in 1938.  They are considered to be very Rare.   Leica Rapido 1934 Slipped onto the rewind knob via a set screw.  Allowed rapid movement of the rewind knob by using your thumb.   Leica Rapid Winder 1935 Attached in place of the normal baseplate, the trigger operated mechanism allowed rapid winding by pulling the lever with your finger.   Cameras below SN# 159,000 needed a modified film spindle that was able to catch the slot of the shaft that inserted into the spindle.   Leica Leicavit Rapid Winder 1951 The evolution of the Rapid Winder brought the leicavit.  A streamlined version of the rapid winder that was made for the IIIf & IIIg.  Early models allowed selction of single or continous advance mode.   Leica Mooly Motor shown on Leica IIIa