Safilo Sliding PD rule in green plastic pouch

Description Of Item: Ruler used to measure interpupillary distance. Steel bar labelled Safilo with graduations 0 to 15 cm on the top edge and 40 to 90 mm on the lower edge. One fixed and one adjustable perspex mounted attachment with cross hairs around a small hole allow measurement of pupillary distance to be read off the lower scale. One perspex piece fixed at one end of rule, the other slides and its position marks the PD on a calibrated mm scale. 'Safilo' marked on front and back with MIM enclosed in an oval on front. Overall size of rule 17 cm (L) x 3.5 cm (W). Black handle encloses end of metal bar.Green plastic pouch shaped to fit the handle and protect the perspex attachments marked 'Safilo' in gold lettering..