If nobody here knows, you can always try the Coleman forum: The Coleman Collectors Forum - CCF Nice find, btw.
If it was made later, I'd call it a 426. That's the three burner. The rounded corners, cast iron burners, and fuel tank the same color as the case are from an earlier era than I know about. Of course, the tank might've been painted the same color as the case at a later restore. Normal color for the period would be Gold.
I think it is a 420, with the front mounted burner controls - this stove had very limited production in 1940 or '41. The tank was probably gold originally, and the case may also be a repaint. Still a rare stove and nice find.
