Faber-Castell Slide Rule 1/87  made of wood with white plastic, probably celluloid, surface, all scales clean and clear,  with cursor and case. Made in Germany.

The slider is reversible with trig functions on the underside.  The edges have inches marked one side and centimetres the other.  There is a useful set of conversion tables on the back. The cursor has markings for kilowatts and horsepower.