An earlier boxed version (c.1957) appears in my book, as kindly noted by Mel, and this is identifiable by the diamond design to the box design being much tighter.
But there are four different styles:
Opal and opal-flashed (transfers applied to the front)
Spray enamel and clear glass (transfers applied to rear)
The clear ones are also known in an earlier promo photo, but were produced much later as well.