This is so important that I am writing it as a first sentence: Do not confuse this vintage basic/manual Singer 500 model with a more modern Singer 500 electronic model. I am not sure why they are NOT named differently but probably because these different models were meant for different markets.

Singer 500 with basic/manual capabilities. It is a standard-gauge knitting machine with a lot of vintage features: vintage S-shaped table clamps, glide-in round row counter and metal end caps that open up (fold out). The same features, including the carriage look and shape, has its predecessor, Singer 200E knitting machine.

However, a big difference is that Singer 500 has a needle selector, which helps to expand patterning capabilities of this knitting machine a little bit beyond just basic/manual.

Several other models have similar needle selectors and features. Needle selectors for Studio SK-101 and Silver SK-101 have less patterning selections but the carriages for these machines are very similar to the carriage of Singer 500. Needle selectors for Studio SK103 and Silver SK103 have the same number of needle patterns/selections (seven) but the carriages for these machines are more advanced. Silver SK-102 has all features of Singer 500. Thus, if you cannot find information for Singer 500, look for manual and brochures on Silver SK102.

Studio SK105 and Silver SK105 are in the same family but have even slightly more advanced features than Singer 500 and all the machines above.