Old Kerosene 500 Egg Incubator???

[jkopsic]

I have this old kerosene heated incubator. The tag on it says 500 egg, Standard No 5 D (as you can see from the picture). We found this in the attic of an old house we bought. It appears to be in really good shape. Can anyone tell me about it or it's value?

Thank you,
Jeff