The largest collection of HAPPY DAYS Memorabilia belongs to Giuseppe Ganelli (Italy), the president of the fan club, and consist of 1439 as verified on 18 February 2018 - Guinness World Records. Giuseppe has been a big fan of the series since the '70s. The first item in his collection was a Fonzie action figure, and his favourite items in the collection are the original Pinball machine used on the set in Arnold's Drive-in and a shirt worn by Ron Howard in the episode "The Duel".

This is a video of the collection: https://youtu.be/OIk6pP6RAv4