Ah, I see.
But are V1's frames the only ones that are stamped with a number?
No, v2's are stamped on the bb
So it seems that:
V1: number stamped on non-drive side rear dropout; 27.0mm seatpost diameter
V2: number stamped beneath bb shell
V3: 27.2mm seatpost diameter; bottle cage mounts; no number on the frame (or at least not under the bb shell)
@Thrasher started
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Ah, I see.
But are V1's frames the only ones that are stamped with a number?