Thanks for your replies guys.
I also found this and I am not sure if the info is correct.

https://talk.maemo.org/showpost.php?...2&postcount=21
N900_NOKNA_BLK indicates N900 for the North American market in Black color
N8-00_NOKUS_GRY on my Nokia.com sourced N8 box label.
E75-2_NOKNA_RED from my Nokia.com sourced E75-2 box label.
5800D-1B_NOKNA_BLK_UPC_V2 on my Nokia.com sourced 5800 Xpressmusic
N78-3_NKUS_SBR_UPC on my Nokia.com sourced N78-3 box labe