A rare and unuaual WW1 French aircraft Delta tachometer by AERA - Paris.
Circa - 1917.
In good original untouched condition having a clear dial, with 'penguin' motif.
The classic symbol associated with this fine instrument maker.
Less well known than Jaeger, AERA mantactured high quality aviation
instruments and accessories of the period.
As fitted to aircraft with larger capacity inline or V8 aero engines.