Is there any brand name sticker on the back? Or maybe a little metal plaque?" I looked through the old ads and found some very similar 1920's McDougal and Sellers brand ones, but none exactly like yours. I also saw one branded "Border Queen" that was similar.
One question about the flour bin- Is there glass looking into the bin, so that you can see the level of the flour in it, or are we looking at the tin side of the flour bin through glass? I'm not seeing anything like in the other examples, but yours sure LOOKS 100% original. I don't think the glass was added later, but wonder if it could have been? So many of them had thin wood in the doors that warped. Can you take a look inside the cabinets at how the glass is mounted to see if it looks consistent with the rest of the cabinet, or if it might have been a later addition?