Are you saying that underneath the sidearts there is a mint AB artwork? Wow!
But let me say that this could not be a "regular" kit, not something sold as kit to operators at least: it's PERFECTLY applied and a regular operator would not apply it like that. (I would expect at least some misalignment, you know what i mean?) My opinion is that it was applied on AB machines from SEGA.
Anyhow, sadly we have only one left at this point if you removed the full kit...