There are two versions of backglass pictured in this listing. The differences are in the colors of the large rings and the color of the Ball In Play sign. The two versions are arbitrarily numbered here:
Version #1: The rings, starting with the outermost one, are colored green-white-red. The Ball In Play sign is orange in color. The flyer appears to be this version.
Version #2: The outermost ring is not black, but a deep red/purple, almost black, followed by red then yellow. The Ball In Play sign is yellow.
This shows a change of colors occurred during production. The flyer would be expected to have the first version as the earliest one. Its glass looks the same as the one pictured in this listing having serial number 1530, which would indicate the change happened after a third of the games were made (unless backglasses were switched between cabinets at any time after they left the factory). More serial number information is needed to help determine when in production this change was made.
