The first Retina Model 117 had a fairly short life, being replaced by the 118 within a year or so. Both have the black enamel finish, the instant way to recognise the 117 is the wind on release knob, this sits slightly taller and to the inside of the main film advance knob. It's task is to release the advance knob after the exposure.

Start the image spinning by putting your cursor over the "Spin" side of the image, you can pause the animation in any position by touching the "Pause" side.