Please help ID griddle, marked CI & M CO, 3, 45 lbs, meas. about 32" x 19"

[JCrilly]

This is my first post here. I'm hoping someone can help me learn more about this griddle. I've owned and used it for about 28 years. I would really appreciate any info., or directing me where to look. I've seen some old posts online of griddles that appear the same, but nothing with any real info. Thanks

 

[SeanD]

Now thats going to be hard to find the maker. I think Griswold and Wagner have griddles with supports like these.....good luck on the hunt!

 

[JCrilly]

Now thats going to be hard to find the maker. I think Griswold and Wagner have griddles with supports like these.....good luck on the hunt!

Thanks, I also joined a fb group focused on Cast Iron. Someone there shared photos of an apparently WW II Gov't contract (assumptions by me based upon markings on the griddle). On the underside it reads:
US
Knox Stove Works
1941

The griddle appears very similar to mine. I think there are some slight differences, but I don't know if they matter or not.

 

[SeanD]

I have heard and seen a few skillets that were made by prisoners. That could be the case here?

 

[JCrilly]

I have heard and seen a few skillets that were made by prisoners. That could be the case here?

Thanks,
I am new to learning about cast iron from a historical standpoint. I've been using it for a long time, but only recently started researching it. I haven't heard of this or considered it as a possibility.