What do the fasteners look like on the 1941 truck data plate? That would be a clue as to whether it has been replaced. The overall look of your 1941 data plate seems authentic, compared to the attached pic of a reproduction one. They were aluminum with most data painted on and weight and serial number stamped into the metal, which appears to be all that's left visible on yours. The "58" would indicate 5800 lb gross weight capacity, which corresponds with a 3/4 ton Special truck.
Attachments
1939-41 Chevy truck repop data plate.jpg (55 KB, 70 downloads)
1941 reproduction data plate
1941 Gross weights.jpg (96.59 KB, 70 downloads)
1941 Gross Weight ratings


Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.