Guilder
03-28-2020

This item is essentially a recolored version of the Memory Traverser's Hat equipment, identical in every regard including stats but for the different coloration. In order to obtain it, you must first collect Ancient Clothes or Ancient Hat items from the Sea of Wonders zone's rare green treasure-laden region. The item(s) you collect must then be subjected to an advanced alchemy experimental recipe that calls for R13 Alchemy/Sewing before it can appear, let alone be attempted. The exact process is still under investigation, but you may examine some clues here:

tyojyuhei.blog20.fc2.com/blog-entry-756.html
tyojyuhei.blog20.fc2.com/blog-entry-757.html
tyojyuhei.blog20.fc2.com/blog-entry-758.html

As the blog suggests, the experiment's results may vary. You could end up with this Legend Seeker item, one of its two cousins, or even an EX version of the Ancient Clothes / Ancient Hat items instead. Fun. I hope this helps you on your own legend-seeking ways. Cheers.

Stats source: tyojyuhei.web.fc2.com/dol_head.html

Beomi
07-11-2020

[Alchemy Recipe] "Restore Ancient Hat" of Complex Alchemy Equipment

1) Skill: Alchemy 13R, Sewing 13R
2) Materials: Ancient Hat 1 + Flask 1 + Ventus Reduction 1
3) Status: Success => Fine Velvet 10 Great Success => Legend Seeker's Hat
4) Player: "Trexxx" on the Korean server
5) Source: ssjoy.org/dho/recipe/2566940 (screen shot included)

Wsp
07-20-2020

Thanks Beomi! I was able to make 1 with your and Trexxx's help