An incredibly rare First World War training poster issued by Air Technical Services on 6th April 1918 for the newly formed RAF.
I have only ever seen three of these for sale - one example of a larger size sold at auction (Nate D Sanders) in the U.S. with a hammer price of $1,000. This example is smaller, approx 50.5 x 75.5 cm, and was bought as an original when I purchased it some years back although due to the smaller size, there is a chance it could be reproduction - as they come up for sale so rarely, I cannot be 100%
Please inspect photos carefully as the item is sold as seen.
One other example from the series is also for sale (see my other items).