It might be that the 12 isn't an inspector's mark. It isn't unusual for these to be unmarked as well.
Maybe it was sold to a merchant ship? Only swords that went through the ordnance board inspection would have been stamped. Although that doesn't necessarily mean that it was Govt property since examples of private purchase cavalry officer swords that also have these stamps exist.
Rules and regulations were a lot more flexible in these times... I wouldn't let that stamp stop me from buying that 1804 all other things being equal. I'd prefer the other one, but more on the quality of the GR mark than anything else.
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