The white labels under the playfield identify the different components and, because they also appear on other games from this manufacturer, we believe they were placed at the factory. The kick-out hole assemblies on this game are each labeled as "Wiggler Hole Ass'y". All nuts and bolts are Metric but the leg levelers are threaded as US Standard 3/8 UNC. We originally listed the date of manufacture as 01-1976. However, the earlier of two inspection stickers pictured here shows a date of 1971. The 1972 Winter Olympics was held in Sapporo, Japan.