Reduced American Classic seat pin

What's the width on this? Trying to work out if it would fit my 89 Fisher Procaliber.

Is it ti?

Tempted to ask for Dibs but I won't be able to confirm whether it'll fit till possibly tomorrow evening.
It’s off my wicked so it’s approx for a 27.2post or 31.8 tube but adjusts up & down those sizes. Not ti I’m afraid