The production run quantity of this Add-a-ball version is likely included in the quantity shown for the USA replay version Bally's 1966 'Loop the Loop'. Compared to that version, the left outlane has a kickback when lit, instead of a replay Special. The outlane rollover for this kickback was placed further down in the space allotted for it, closer to the kickback mechanism, than the rollover for the replay version. The backglass has no replay window. The silkscreened numbers 0-9 that would be the match numbers on a replay game are instead used to count the added balls. Hence, the 0 number is not required and, although the backbox insert has a lamp socket in this 0 position, no wire was soldered to it. This game apparently was not exclusively for export to Italy, because the game pictured here with serial number 'LL 1660' is located in the USA and has a metal coin entrance plate marked 10�. The flippers are imprinted with the word FLIPPER, a word that was not allowed on games in Italy.