Hi, you mean the hub? That looks like an original hub to me; the rebuilders typically, if they change the hub, install a dual pattern one with both large and small bolt patterns.
That is an original type of head marking I've seen on bolts, if they're all the same, that would lend credence to guessing that they're original; are there captured star (lock) washers on them? Originals usually were, in my experience.
The A1 is likely just a casting / check number. I've seen it before. I have an 811 pump here with just an "A" there.
Cheers,
Anthony
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