Bendix/Pioneer RPM Instrument Identification

[konig]

Hi All,

I am trying to determine the possible date of manufacture and use of this aircraft RPM Indicator. It is a type: 2219-2a2-b and states its a dual tachometer.
My guess is that it is around the 1935-43 mark but am unsure. Any help would be appreciated.



Thank you.

[warbirdfinder]

This type was used on my Stearman PT13D/N2S-5