CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins84% CONFIDENCEOverall confidence: 84%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
Coasterpedia[3] and Wikipedia[4] both date the Olympia Looping's Oktoberfest[2] debut to 17 September 1989.The 34-meter, five-loop Olympia Looping premiered at Munich's Oktoberfest on 17 September 1989, becoming the largest portable roller coaster ever built and the only one with five inversions.
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