King
From NBWiki
King Sewing Machine Company
Main Street, Buffalo, New York
King
Domestic and King Comparisons
Serial Nos. 603588 (Domestic) and 141856 (King)
Courtesy of Kelly Pakes
The following pictures illustrate the differences between a Domestic machine and a King. The Domestic has a more angular shape. Whereas the Domestic has a shuttle eject button and serial number on a plate, the King doesn't have automatic shuttle eject and its serial number is under the front slide plate on the bed of the machine.
Compare too with another style of Domestic #391536 with round body HERE and the White Vibrator No. 8 (also known as the Domestic King) HERE