Can anyone tell me what this is?

Went to a little shop and found a cute little square Griswold egg pan for my birthday. While I was there the owner showed me a piece, neither of us know what it is for sure. I took some pictures unfortunately the light was not great. This piece has a swinging door on the front that is held in place by a small pin.
 
A line of text on the door appears to be a patent date. Perhaps that, coupled with other information inscribed on it, might be enough to find out what it is through a patent search.
 
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