I think a new one could be "characterized" pretty easily. Just apply the sole of your passenger's #12 on it a few times. FYI, my heater originally had a decal rather than the domed metal plate. Decals are available too, but would be harder to "characterize."

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.