George Allen wrote (reduced): regarding going from 120 to 126mm
3) Buy 120mm hubs, change the axles to 126mm and then have the wheels built up. But then I'll need longer a QR. I assume you can switch out to a straight lever from a curved lever QR.
Test don't guess, with the curved skewers that read open & locked, the mechanical dimensions are slightly different, old levers in later skewer end cases are a no go, the axles may be the same, measure first.
The period correct officials will notice if the hub bodies are matched to the skewers by looking for the stamped thread spec. on the body, earlier hubs did not have this. There were subtle machined ring identifiers as to thread type but no numerals.
Regarding lock nut & cone stamps, only the mechanic will know for sure and or the next owner.
John Jorgensen
Torrance Ca