Aircraft Recognition Manual, USAF 1955 AF Manual 355-10 B-29 the indicator displayed total fuel

the indicator displayed total fuel quantity up to 16

Heading Pointer

75 inches high and 5

It appears to be New Old Stock as the red protective paper disc over the vacuum filter is still in place

It is missing its rear cover

Aircraft Recognition Manual, USAF 1955 AF Manual 355-10 B-29 the indicator displayed total fuelThis 176 page Aircraft Recognition Manual for the Observer was provided to personnel of the Ground Observer Corps, an organization under joint operation of the US Air Force and civil authorities. Observers worked within the structure of the Ground Observer Corps to ensure proper training and communication. Observers, who were US Citizens and volunteers, would train to become "Qualified Observers". Observers were responsible for spotting aircraft of US