Mach Speed Indicator, .3-1 Mach, Aero Commander/IAI Westwind Lily Bomber The housing looks to have

The housing looks to have been repainted at some point in its history

At almost 200 pages

for the US Army Air Corps

each holding 0-60 gals

The two neon bulb holders are in place

Mach Speed Indicator, .3-1 Mach, Aero Commander/IAI Westwind Lily Bomber The housing looks to haveThis is Mach Speed Indicator, or Machmeter, was made by Kollsman for an Aero Commander aircraft as it is made to an Aero Commander part number, 3883063 1. Likely made for an Israel Aircraft Industries (IAI) Westwind (formerly Aero Commander 1121 Jet Commander). Measures ~3. 25 inches diameter and ~4 inches deep. Can't tell how fast you are traveling relative to the speed of sound without a Machmeter!