Mark,
do you mean 4 digit in the backglass? I have never seen one of those. Can you post some pictures?
Is it not the same schematic as these ones ?
http://www.ipdb.org/search.pl?any=dipsy+doodle&search=Search+Database&searchtype=quick#683
I forget if the 5th digit is a real reel of if it is a sticker
Jeff