Bruce,
Thanks for indicating the relevant tables.
Unfortunately, TPS isn't definitive in this case since the gun predates written records and Fig. 12.17 lists 14 ga being available in 1869 even though not listed in early listed catalogs.
There is no chamber info for a 12B shell in TPS and the table of chamber data is standardized as of 1920 some 50 years after this particular gun was made.
A 12B seems the best guess but it still remains a guess without the owner taking the initiative to have the chambers and bores measured and originality determined.
This is an interesting gun for which more info is warranted.
Erick
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