iPhone 4

The logic board is a larger piece of the iPhone 4 and can be considered one of the most important pieces of a phone. It is the motherboard or control center of the iPhone. Every command/control goes through the logic board.

This particular piece was made in 2013 and manufactured by  SKYWORKS and/or Apple. There are 17 bits within the logic board, making it incredibly hard (and expensive) to fix/replace. 

SKYWORKS is a engineering company who specializes in manuacturing pieces like this one. They have three locations, each in a different continent: North America, Asia, and Europe. It it not specifically stated, but my best guess would be that since the majority of all the other parts of this iPhone 4 were made in Asia, this part was most likely made at the Asia location.