Version 1 β€” 21Γ—21 β€” This reads, "Ver1" Image: Autopilot

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Version 2 β€” 25Γ—25 β€” This reads, "Version 2" Image: Autopilot

Version 3 β€” 29Γ—29 β€” This reads, "Version 3 QR code" Image: Autopilot

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Version 4 β€” 33Γ—33 β€” This reads, "Version 4 QR code, up to 50 char"

Version 10 β€” 57Γ—57 β€” This reads, "Version 10 QR code, up to 174 char at H level, with 57x57 modules and plenty of error correction to go around. Note that there are additional tracking boxes"

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Version 40 β€” 177Γ—177 β€” This reads, "Version 40 QR code can contain up to 1852 chars."