If rebacked it is a decent rebacking.
That one is not previously known is not evidence it is rebacked. Previously unknown T cards still arise pretty much every year - I've found a few that surprised me. It is not out of the realm of plausibility that a sheet or two early on in pre-release production may have used the earlier backing. With a T card survival rate that appears to be below 1% it wouldn't be odd to have a single card found of such a sheet.
No opinion on either option as this one is good enough to pass in a scan if it is rebacked, but both are fully plausible.
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