Great work, Jon.
The revenue collector's main office for California's Revenue District Number 1 was located in San Francisco. Los Angeles was home base for Revenue District Number 6. The only other active revenue district number in California at the time was District Number 4, headquartered in Sacramento. Broadly estimating, I'd guess your Mono manufacturer was located in Central California, probably San Francisco or Oakland, despite the preponderance of LA subjects in T217.
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