I have a similar Missouri Meerschaum with a hardwood plug and Whangee bamboo stem. Mine might be the HA-5 model. It’s my understanding that it’s from the ’60s, as @rustiepyles mentioned.
I thought for sure the inner bowl would be junk when I saw the outside. Inner bowl looks as good as any of mine that are smoked. Crazy pipe find. Thanks all, good discussion.
The outside looks like when they used to "burnish" the outside by spinning the cobs against pieces of cottonwood. I've seen a video of that somewhere...