Aircraft Recognition Poster, Kawanishi Type 97 Mavis Japanese Patrol Bomber, 1943 Short Sunderland The unit requires calibration as

The unit requires calibration as we are unable to adjust it to view the sky in the viewfinder

This is an original WWII-era manual

Here is a fine example of a WWII-era Remote Indicating Compass AN-5730-2A as appeared in the cockpits of many aircraft of the US Army Air Force and US Navy

It was also used in the Gyro Flux Gate Compass System as a remote direction indicator

Aircraft Recognition Poster, Kawanishi Type 97 Mavis Japanese Patrol Bomber, 1943 Short Sunderland The unit requires calibration asHere is an original WWII era Recognition Poster for the Japanese Navy's Patrol Bomber Seaplane Kawanishi Type 97 Mavis as published by the US Navy Jan 1943. The poster displays 4 recognition images. The poster measures ~18. 5 x ~25 inches. It is in good condition for its age.