I actually own another one of these GameBoys!
About a year ago, I asked about the logo on Reddit in /r/GameCollecting, and was linked to this particular thread. Going through my old posts, I decided to check back to see if there had been anything new and, what do you know, some replies here are only a few days old! Anyway, I was surprised, but I am hoping I may have some new information for you guys. However, I'm not sure how helpful it will be.
You can view my original post here: http://www.reddit.com/r/gamecollecting/comments/1ly8w7/i_fou...
To sum it up briefly, it seems that there are a total of three confirmed GameBoys with this logo (two mentioned in this particular thread, and mine). I am certain that, at the very least, mine and the original poster's GameBoys both have different serial numbers. However, there is no real logo that seems to match up when trying to do an image search on Google. I have emailed Nintendo, but they have no records of the GameBoy, so it must have been a company's logo of some kind, which is odd considering that the logo is nowhere to be found. Hope this helps! I'm really curious as to where this came from - I simply got mine at a garage sale with no box or anything that could give a hint as to where it came from.