Ok, let me tell you why that little seal in the back of the map is awesome. Small spoiler from the books though.
Time of Contempt" minor spoilers
[spoiler]The seal is from the Oxenfurt Academy, the most important academic institution in the Northern Kingdoms. So a map like that is kind of expected to come from there. The cool thing, though, is the signature - Fabio Sachs.
Fabio Sachs appears in the books - in Time of Contempt, to be exact. He’s a bank clerk that gives Ciri a tour of the city of Gors Velen, before she goes into a school called Aretuza. But here’s the awesome part (quoting from the book):
“I don’t want to get married. I don’t want my fortune told. It’s hot and that tent stinks of incense. I’m not going in. Go in yourself, if you want, and I’ll wait. I just don’t understand why you want a prophecy. What would you like to know?”, said Ciri.
“Well…” stammered Fabio. “Mostly, it’s… it’s if I’m going to travel. I’d like to travel. And see the whole world…”
“He will”, thought Ciri suddenly, feeling dizzy. “He’ll sail on great white sailing ships… he’ll sail to countries no one has seen before him… Fabio Sachs, explorer. He’ll give his name to a cape, to the very furthest point of an as-yet unnamed continent. When he’s fifty-four, married with a son and three daughters, he’ll die far from his home and his loved ones… of an as-yet unnamed disease…”
“Ciri! What’s the matter with you?”
So CD Projekt Red is actually honoring a minor character in the books, and showing how much they love the books and the Witcher world by paying attention to such a small detail. Gotta love that.[/spoiler]