Singer's model 99 is the 3/4-size version of the model 66. A sweet little machine that was made for many decades, at least from the 1920s through the 1960s.
The earliest versions had a stitch-length knob, no backtack, a fancy needleplate, and came in glossy black with filigree decals and a kneebar controller. (They did not come with a handcrank, the machine pictured below is a recent conversion.)

The war-year machines (1940s) were krinkle finish, with a stitch-length lever and backtack.

And the latest versions were glossy black with the simple decal set, stitch-length lever and backtack, a simple striated needleplate, a spotlight, and foot controller, and came in the "modern" red and yellow rectangular cases, rather than the earlier bentwood ones.

The early model 99 that I have came in a bentwood case with a top that was fitted to hold the kneebar, an oil can, and a box of feet/accessories.

I've removed the holder for the accessory box to accommodate the handcrank I added, but the oil can and kneebar are still inside. See sidebar for closeup of Singer oil can.
The case refinished beautifully!

This machine came with a fairly complete set of attachments, an original manual, and an original key.

I converted this to a handcrank by replacing the handwheel with a reproduction spoked wheel, and removing the electrics. I've saved all the parts, so it could be converted back to electric if one was so inclined.

The "modern" electric model 99 I refurbished is equally beautiful, but in a different way. It, too, came with a fairly complete set of attachments and an original manual; the oil comes in a tube rather than a can. This machine is powered with a foot controller.

I love the lamps on these machines. Reminds me of a bug's eye.

If you're interested in purchasing any of these machines, please contact McKenna.