1930s to 1940s Turning Slide Slip indicator by Reid and Sigrist Ltd. Yellow lettering and yellow arrows- paint from one of the arrows have peeled off. The paint below the yellow arrows is also peeling and is an ivory white color.

Models similar to this were used in blind flying panel of aircraft of the British Royal Air Force and the Royal Australian Air Force of WWII (https://aeroantique.com/products/turn-and-slip-indicator-mk-ia-raf-1937?variant=37115798538).

The indicator for sale in this listing lacks the incremental marks by 0, so I cannot verify what aircraft this item was used in.

Measures 10 cm on the glass Guage, and  11 cm across on the casing around the dial

Last serviced in 1940.

Supplied by Sigurdson Aviation International Limited.

Instrument division: The Ontario Hughes Owens, CO.