3rd Generation iPod Touches have the Model Number: A1318
2nd Generation iPod Touches have the Model Number: A1288
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Physically, they are identical
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On The Outside, they are identical.
1st Generation iPod Touches Look Completly Different. (Flat Back, Rectangular Wifi Antenna, Not rounded around the front)
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The 2nd gen, and 3rd Gen 8GB models, are hardware identical as well, 32GB's are different for each generation, and there was no 2nd gen 64GB, and no 3rd gen 16GB.
3rd Generation iPod Touches have the Model Number: A1318
2nd Generation iPod Touches have the Model Number: A1288
Physically, they are identical
1st Generation iPod Touches Look Completly Different. (Flat Back, Rectangular Wifi Antenna, Not rounded around the front)