Weeew ! I have finally got one ! Lostex com.ssa Architecture ver. !
The insert is made of very good quality and feels really nice. Lost is one of the older japanese penspinners.
The website of Lost : http://pslostex.com/
He made his own version of com.ssa with outsert in limited version, you can check all these version here : http://pslostex.com/category/pens
If you want to get one, you have to trade with Japanese Penspinners, sadly !