According to the manufacturer, there were 3 or 4 prototype games made of 'Oktoberfest'. We know of one that was on auction in Germany in October 2019. There were three versions of backglasses made: � Prototype backglass #1 - the "naughty monkey" backglass. Otto the bartender and Inga the waitress are not present. � Prototype backglass #2 - Otto is holding a stein in his left hand. Inga is empty-handed. � Production backglass - Otto is holding a stein in his right hand. Inga is holding a string of carnival tickets in her right hand. There were two versions of art made for the lower cabinet: � Prototype cabinet - on each side of cabinet, the name Oktoberfest is partially obscured by either Otto or Inga. � Production cabinet - the name Oktoberfest is fully visible on both sides. A shaker motor and knocker were each available at additional cost. MSRP when new: $7,395