Nice seat!
I see yours has the very same numbers as mine does...
570-598.
I found out the hard way that both the low version and the standard share these.
Sargent's site, at least to me, made it look like different numbers were used between the two versions, and confused me.
I bought one last year on Ebay, and specifically asked the guy selling it if it was the low or the standard. Told me it was the standard, so I bought it.
Came in with the big 'ole "low version" tag on it...
So those numbers are just to reference the seat pan...
Not to tell one from the other.
The tag that says "low version" does that, but the seller should be honest enough to put a pic of that in their ad. In my case, didn't happen.
Too bad you didn't get to try it out!
Looks nice, should sell well here.
Good luck!
BTW,
What bike did you buy?