To respond to some points that were raised:
A magnet is attracted to the barrel, so it isn't bronze.
The brass doesn't show any sign of recent cleaning.
There are threads inside the vent, and the fit of lock to stock is relatively crude. I am grateful that, whenever the percussion lock was replaced, a genuine EIC lock was used. At some point I do plan to dismount the lock for inspection. However, a Nepalese Brown Bess in much greater need of attention has first claim on my spare time for now.
Many thanks to all for the positive and helpful comments.
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