Which of these Pokemon crystals is the legit one?

Question

Hello I want to get Pokemon crystal but I can't seem to figure out which is the ofentic version.
The only difference I can find is that the one to the left says "EUR-1" and have the CE mark. While the one to the right only says "EUR" and don't have the CE mark. (both looks the same on the inside)

Answer 1

I would say the one to the right is the more established authentic one. Without the CE Mark.

This is the original, from Mobygames.

Further, this GameFAQs shows CGB-BYTP-EUR to be the released version in this table here. A Redditor posted his/her EUR version of Crystal, and the general consensus was that it was real. Don't take their word for it, though, they might be arm chair investigators. Still, it's highly likely it's authentic.

Here's the deal though:

I can't say for sure the other's fake. The EUR-1 could be due to

The letters "CE" are the abbreviation of French phrase "Conformité Européene" which literally means "European Conformity".

Source

and that

The EUR.1 is most importantly recognized as a certificate of origin in the external trade in legal sense, especially within the framework of several bi- and multilateral agreements of the Pan-European preference system (the European Union Association Agreement)

Source 2

Of course, I'm not saying that makes them 100% authentic, and, to be on the safer side, I suggest you take the EUR and not the EUR-1 version.