Never seen anything like it, make is very interesting. I know round bobbin machines are considered modern compared to long bobbins, but they have been around since the early days (1870-80s?), and I think Singer model 128 (long bobbin) was in production until the early 1960s, and it definitely does the job with a motor and light setup. I guess the vibrating shuttle on your Grand Electro is a clever adaption to the swing arm needle. I wonder if it's a prewar model or a 1950s model, the white plastic clamp holding the machine to the base looks like it's nylon, and I guess 50s?