Emery Clipper

Hello all

does anyone know about the Emery clipper?

I know it was made in 14" and 17" cutting widths just before and just after the second world war,

does anyone know a way to distinguish between those made before and after the war?

ie. are there any physical differences? and does anyone have the records of the serial numbers?

Because I want to know whether a certain Emery clipper is Pre or Post War.

Best Regards

Seb.