On Dec 8, 11:01 am, "Paul Remde" wrote:

...and the stand on which they adjust altimeters.

All the airspeed indicators on the test stand have no markings, and it
looks like the technician is using a grease pencil to add a marking.
So I'd wager a guess that each airspeed indicator has a custom face to
correspond to the variances in the mechanisms.

-Tom