I'm not sure when they came out what they came with and then what you could buy extra. I do know I have bought them with and without attachments. Yes the bobbins are smaller then most bobbins, they are narrow.
The main thing is does it sew. Does the motor smell when running. You thread it through the needle from right to left.
The serial number is on the underside above and to the left of the bobbin area. It should have 2 letters followed by 6 numbers. Is the spoolpin there? Is the elc cords in good shape? a bobbin casing and bobbins if they are not there will cost around $40.00. Make sure it is a singer, and not the china made newer model that has come out.