Thanks for your comments, Don. I messed up putting up the photos. I'd intended to put up all four views of the cannon (top, bottom, left, and right) but had only put up two copies of the top image. I've updated the post and hopefully have all four views up now. One of the oddities with this one is the barrel extension doesn't have the full four serial number anywhere (just the last two, '81', on the extension lug. It does have that dished area on the left extension flat where (presumably) the original serial number may have been.
There are also no firing proof on the breech block or barrel extension. The only firing proof I see is one the barrel.
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