Alrn
01-31-2019

After reaching Rank 5 of Commercial Battle License, you can obtain this by giving away 5000 Merits to get one. According to JP wiki, here's the list of Reward (you get one of these randomly) :

5x Navy Dispatch Request
Asclepius' Medicated Bath
Master's Thesis on Navigation
Ambrosia
Master's Tailoring Tools
Master's Repair Tools
2x Copper Holy Grail
Holy Water Sprinkler
Damascus Swords
Seeker Coat
Commercial Nickname Issuing Documents (No.1)
Improved Shell Specifications

While some from the lists are confirmed obtainable in Maris, the others could be removed/swapped to something else. But yes still need confirmation and need to be checked later

Wsp
02-01-2019

I confirm that I have received ALL of these items EXCEPT for the ascelpius medicated bath. I am sure it is still in, but luckily I haven't received it xD.

It seems the rarest item is the nickname document, with reports from Japanese wiki saying it is 1/50 chance

Alrn
02-01-2019

I confirm that i received the Ascelpius' Medicated Bath today.

So all the lists are confirmed eh