LW aircraft speed specifications

[Crumpp]

They could have used russian dials if the germans had smashed them up and or disabled/ruined the aircraft on those airfields which were over run. Crash damaged is another issue.

They would not have to change dials. It is calibrated by pressure differences.

The differences though are measured by the calibration equipment. If the calibration equipment uses a different yardstick, the results will reflect it.