backglass
Noun
Meaning
backglass (usually uncountable, plural backglasses)
(pinball) An upright graphic panel mounted on the front of the backbox and decorated with game artwork.
Examples
Games are generally built around a particular theme, such as a sport or character and the backglass art reflects this theme to attract the attention of players.
On older games, a broken backglass might be impossible to replace, ruining the game's appeal.
Since the artistic value of the backglass may be quite impressive, it is not uncommon for enthusiasts to use a deep frame around a backglass (lighted from behind) and hang it as art after the remainder of the game is discarded.
These extra balls were indicated via lighted graphics in the backglass or by a ball count wheel, but in some areas that was disallowed, and some games were shipped with a sticker to cover the counters.