Here we have two Regina Toy Sewing machines. The Regina Toy Sewing machine manufactured by Muller in in Berlin in the US-Zone . They had been manufacturing toy machines since 1885. This is a later one manufactured in the Fifties or Sixties. A simple chain stitch, but battery operated.
This Essex miniature sewing machine makes a very simple chain stitch and was manufactured from 1946 to 1956 by the Essex Engineering Works. The design was based on the Singer 20 model. It is not a toy.
This plastic Singer lock stitch toy sewing machine from the late 1960. This machine makes a full lock stitch unlike the chain stitch most of the other miniature machines do. It uses a transparent version of the boat shaped transverse “vibrating” shuttle very much like the ancient Singer 12.