The model number is on the label behind the battery.
In fact it might be a little more complicated, because there are a series of FCC approval references for this model, probably relating to pcb changes. Whether all saw commercial release is open to doubt until we find samples in the wild but the test reports make interesting reading.
I suspect the 71 and 72 variants are a cosmetic change which doesn't impact RF components and regulatory approvals. Maybe keyboard layout, camera/non-camera, or possibly even white/black body. It appears they are all approved as the generic ...70xx model.
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