Hi,

A mate of mine has a ruler which is about 18 inches long and a bit wider than a normal ruler. One side is marked in inches like a normal ruler, the other has two sections marked off speed in miles per hour and the other bombing error in yards. It was made by Stanley.

My first though as it is made of aluminium it is post WWII, and metal was very precious during the war. Any thoughts?

Cheers,

John.