Without more details, it's difficult to say what the origin is. One insider shared this with us:
Yet, Kevin has suggested that it might be a war insignia. That makes sense. Definitely looks like something the Disney Studio could have created during World War II.It looks a lot like a studio equipment sign...something they would attach to a light truck or generator. However, the image, the signature are so off model, I would be surprised if it was from the studio. Could also be a building sign.
If you know more information about this Snow White sign, we'd be happy to add it to this post.