Compass, Pilots Repeater Indicator Mk I RAF Ref 6A/1584, Distant Reading Compass PV-2 Harpoon or 30 at its 6

or 30 at its 6 o'clock position

and a bracket to affix the sighting tube to the gunsight

It has the "YEW" symbol of the Yokogawa Electric company on the back of the case

The cover is printed in gold Cyrillic letters: DEVICE FOR CORRECTION OF FIRE

but could be replace with fresh fluid

Compass, Pilots Repeater Indicator Mk I RAF Ref 6A/1584, Distant Reading Compass PV-2 Harpoon or 30 at its 6Here is a WWII era Compass, Pilots Repeater Indicator Mk I Stores Ref 6A 1584, a component of the Distant Reading Compass system, as use in early versions of large British RAF aircraft such as the Avro Lancaster, Vickers Wellington, and Short Sunderland (see image showing the location of the indicator from the Lancaster Pilots Notes from 1944). The serial number is evidence of it's year of manufacture of 1941. Here's a bit of history from the