Hello,

I have a boba fett with a number 2 on the back of the head. I first tried to arased it, but didn't succed, and now I wonder if someone has an explanation for this letter, maybe somekind of figure from production work?

I think Steve (The_Dark_Artist) would be your best bet to help answer that one.   

Hello : )
Where did you get him?
The last time I questioned a collector about an Engineering Pilot, I ate crow, then we became good friends and eventually I helped him get his figures authenticated as Engineering Pilots by matching hand writing samples to my own EP's.
But there is a big BUT here, that other collector found his in a verified find from a former Kenner Employee. That's why I ask where you got him. EP's are mostly production figures, the very end of the line for pre-production that have numbers usually under their feet. Although I did have a first shot Lando with huge number "2" on his back. With all that said, a lot of times, kids would write initials, or numbers, or symbols to distinguish them apart from other friend's figures. EP's have to have provenance to prove they came from a Kenner source, otherwise they are just looked at as another production figure. One other sign of it being an EP would be if it is incomplete, missing a sticker, paint ect... also extra flashing around legs and under feet...
Hope this helps and sorry for my book. When you have a chance let me/us know where you got your Fett.
Thanks, Steve

hello
thank you very much for that answer.
I don't remenber where I got it from, I have it since more than one year and it's a hong kong with nothing special to me except this number. it was a time when I used to buy lot of boba as I did a little focus.
Maybe I can try to do a research in my mails, but little chance to succed.

Yup, unfortunately without some provenance it's really hard to say. I just saw another Fett tonight on a For Sale thread that has a "K" under his foot. Most likely a case of an initial being written on by the former owner. If you could find some history of it and where it came from, it may help.
Take care, Steve