Blue HP 50g for North America?

[everettr]

About a month ago I bought a blue HP 50g off of TAS. It was new in the blister pack, but right away I was a bit confused. The language on the pack was English, not Spanish. I was under the impression that the blue 50g was just for the Spanish market, see:
Thread on new blue HP 50g

Can anyone explain what is going on with these blue 50g's?
There is no serial number sticker on the calculator. The internal serial number text is,
"HP50 Serial Number: CNA1350976"

Thanks