Sometimes it amazes me that my mind can work so SLOW.
It occurs to me that a Perpetual Hourglass has a timer on it.
You buy a Timeless Hourglass for 1,000,000 gil from the NPC, and once it is traded with a set of Trail Markings it becomes a Perpetual Hourglass. Which has a 210 minute timer.
Even supposing this was a real Perpetual Hourglass that had just started ticking down when the OP made this thread, the time limit is way past now.
Are they still trying to sell it?
Lol I'm serious now, I really will buy that used Perpetual Hourglass off you for 1 gil. Since I'm nowhere NEAR high enough a level to participate in Dynamis, it would be nice to see one firsthand. =)