Brand: X - Unknown
Made in: USA
Made by or for R. & M. This pencil is not labeled by any of the major manufacturers on my list, thus would fall in the category of unknown. That said, the pencil’s texture looks very much like the Diagraph, so this may have been made by Eagle.
I call these “Quazi” brands because I’m not 100% certain which company actually made them. Sometimes the pencils are stamped with a stationery store or maybe even the name of someone famous. But my hunch is they were produced by another company. If you have more information about any of these vintage pencils I would love to know!