Not sure. I wasn't ready for specifics yet, still trying to get a handle on what the bike might be worth. I'll get into the garage tonite, make some notes,and post them tomorrow. The 23 inch is roughly equivilent to a 58cm frame size. It's one size down from the largest 520 frame size.
In my opinion the most important measurement is top tube length. Standover height only matters when your stopped and straddling the bike. Unfortunately, many shops use it not only as a primary fitting tool, but as their only fitting tool. In fact, on a standover basis this bike fits me perfectly. However, with my long torso it's too small length wise and was impossible to dial in with different stem/bar/seat combos. That would have been good to know before the check cleared. My solution was to hang the bike on a hook and continue to ride my older 520. I bought a new 25 inch 520 two years ago. By standover standards, the bike looks to be too big for me. Yet, while riding, it fits me perfectly.