That TAM is SERIOUSLY cool. The inside is bronze and there's not one thing about the TAM that shipped and that prototype this is the same.
You've got quite an eye there. You always ask about the good stuff! That could be one of the rarest pieces I have. Those are iPod touch Instron (machine that measures pressure/pull strength) samples. Engineers would use the machines to push with a certain force to be able test the force required to break a screen. The lines were used to measure where it cracked, how large the crack was, etc. Those units passed the force required for the spec.
The other one that looks entirely black (iPhone 4 back w/no writing) is for swapping antennas which is pretty cool.
You've got quite an eye there. You always ask about the good stuff! That could be one of the rarest pieces I have. Those are iPod touch Instron (machine that measures pressure/pull strength) samples. Engineers would use the machines to push with a certain force to be able test the force required to break a screen. The lines were used to measure where it cracked, how large the crack was, etc. Those units passed the force required for the spec.
The other one that looks entirely black (iPhone 4 back w/no writing) is for swapping antennas which is pretty cool.