FYI,
I just reached out to the seller to inquire about this lovely bass.
He said he would take $5000 USD plus shipping.
He was unaware that it is in fact a Series 1. He just referred to it as "the same bass that Stanley Clarke" uses.
I asked him if it was a Series 1 and his answer was that he didn't know what I was talking about.
I pointed out to him that it clearly says "Series 1" at the top of his spec sheet and then he seemed to get it.
So, yes it is a Series 1.
Price is a little high for me BUT it is in excellent shape, comes with the original blue case and DS-5.