Mills slot machine cover on ebay

[coppinpr]

Saw this unusual little item on ebay today, "original Mills slot machine cover". Never seen one before. It has a small pocket in the back. What was that for?

[gameswat]

The pocket is for keys. Modern for the collectors market in the last 40 years. This advert is from a 1989 Tom Krahl catalogue.

[coppinpr]

ah...my first thought was the pocket was for keys but that didnt make sense because I didnt consider the obvious fact they were made for collectors! thanks

I see they were available in "Casino green, nugget yellow and carousel blue" so the one for sale is Nugget Yellow