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I don't think Maurice was consistent early on. He had to have model number on the sheaths for the most part if for nothing more than efficiency in production.
That being said, I ran thru some old photos and found more than a few Johnson BB with model and length, and in fact, it appears a sheath with neither is far less common and is the odd man out.
This may take a bit more looking into, and I will keep an eye out, but sheaths sans any marking from Johnson seem to be fairly uncommon.
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