1st WW Trench Art ash tray or office tidy 1st WW Trench Art ash tray or office tidy
About 1.3/8" high, 2.5/8" at the widest point and 6.1/4" long.

Made from a section of wooden aircraft propeller, with a beaten aluminium depression, unusual souvenir of a RFC fitter, who probably used a small piece of cowling to make the dished part.