The primary distinguishing characteristics are the riveted frame, stock holding clamps, flat bar feet and green color scheme. This particular specimen is said to have been found with, and fits, a 30″ x 6″ saw. Therefore when shipped with a saw it was known as Model #1306, and when shipped without a saw it was known as Model #1004.
Photos courtesy of Ben Bama, Seattle, WA.
A Langdon Mitre Box Reference 