This is an original aftermarket oil sight gauge for a Model T Ford. It replaces the two taps on the sump to check the oil level. Typically a plug was fitted where the upper tap was, and this gauge was connected to the lower tap fitting, with the lower tap than attached to this gauge. The height of the gauge meant that is was easy to see the oil ..
Broken down. Not working. Could bake a working engine from the 2. Found in grandfathers / uncles garage along with large amount of other de Dion parts..