The dimples were called "multi-flectors and Ever Ready claimed it intensified the beam. Apparently they were hand stamped at random locations. Matter of fact that light was called "the Ever Ready Multiflector"
Most were mahogany, some were teak or walnut.
Model #1686. They were made up to 1939.
American Eveready had one beginning in 1914 that had an oak case and machined dimples.