Ritchey WCS Seatpost

Sorry gents just to clarify, this is a Wichie WCS Wet look seat post to fit a k100. Advertised at 25 but 30 euro to any club member... Ideal for a 1:1 2x9 + 1 setup.
I prefer a 2:1 pull ratio, if you know what I'm sayin....
Is it the post '89 20 spline ABS model?