Link:
http://www.quiltingboard.com/vintage...s-t277707.html
The top long bobbin machine and the second long bobbin machines are not the same model or the top one was refurbished. If it was from 1904 it was refurbished or motorized.
Why is the top machine's bobbin winder at the top of the machine and the other long bobbin winder low? That was either original or from a refurb. You can search ISMACS for the serial number to be sure what model you have. Is the top machine smaller than the top? The machine at the top is either a later model than 1904 or it has been refurbished. Is there a motor boss or did they drill a hole for the motor to mount?