International Mobile Station Equipment Identity - Wikipedia, the free encyclopedia: Prior to 2002, the TAC was six digits long and was followed by a two-digit Final Assembly Code (FAC), which was a manufacturer-specific code indicating the location of the device's construction. From January 1, 2003 until that April 1, 2004, the FAC for all phones was 00. After April 1, 2004, the Final Assembly Code ceased to exist and the Type Allocation Code increased to eight digits in length.

So every Nokia N900 has TAC 35693803 with no difference in country of origin.