He was once the most famous Disney character in existence, the first animated creature to entertain a nation of children while Mickey Mouse was but a twinkle in the eye. 
 
 Oswald the Lucky Rabbit, the long-eared precursor to Mickey , is to become a star once again after a long-lost Disney film was discovered. 
 
 A frame from a rare, long-lost, Walt Disney animated film Sleigh Bells (1928) featuring the first ever Disney character, Oswald the Lucky Rabbit Photo: BFI National Archive/Walt Disney Animation Studios 
 
 Sleigh Bells, a six-minute-long animation, was first broadcast in 1928, but has long disappeared from public memory after all copies were lost. 
 
 Next month, a fully-restored version of the film is to be screened for the first time in decades, after a researcher spotted it among one million items in the BFI National Archive. 
 
 It is understood to have been donated to the extensive archive in the early 80s, as part of a collection of film stock from a closing Soho laboratory. 
 
 No-one, however, noticed its significance, and it was entered into the archive’s database and left before anyone realised it was the only surviving copy in the world. 
 
 Earlier this year, an American researcher, who was looking for lost titles, typed the name of the film into a new online database at the BFI, and was astonished to find it was in its stocks. 
 
 The long-lost film, the last surviving record of Sleigh Bells, will now show Oswald the Lucky Rabbit in all his glory. 
 
 Fans of Disney will recognised the character’s close similarities with Mickey Mouse, with just a long pair of ears to distinguish the two. 
 
 His creators, Walt Disney and Ub Iwerks, went on to create Mickey, following a contractual disagreement with Universal, for whom they had created the Oswald films. 
 
 A spokesman for the BFI said: “Oswald the Lucky Rabbit was invented by Walt Disney in 1927 and was loved for his mischievous and rebellious personality. 
 
 “A number of other films do survive but Sleigh Bells has been, until now, a lost film, unseen since its original release.” 
 
 Robin Baker, head curator at BFI National Archive, said, “What a joyful treat to discover a long-lost Walt Disney film in the BFI National Archive and to be able to show Sleigh Bells to a whole new audience 87 years after it was made. 
 
 “The restoration of this film will introduce many audiences to Disney’s work in the silent period – it clearly demonstrates the vitality and imagination of his animation at a key point in his early career.” 
 
 Andrew Millstein, president of Walt Disney Animation Studios, added, "The Oswald shorts are an important part of our Studios' history, and we have been working with film archives and private collectors all around the world to research the missing titles.” 
 
 The world premiere of the new restoration of the film, by Walt Disney Animation Studios, will take place at BFI Southbank on December 12 as part of a programme It’s A Disney Christmas: Seasonal Shorts. ||||| Story highlights Rare film dates back to 1928 -- the same year Mickey Mouse was created 
 
 A researcher re-discovered the "holy grail" of Disney films while browsing an online catalog 
 
 "Sleigh Bells" has been digitally remastered and will premiere in December 
 
 (CNN) Mickey Mouse is Walt Disney's most popular cartoon character and a staple of almost every childhood in the western world. 
 
 But, had a business deal gone differently, would Oswald the Lucky Rabbit -- the first Disney character ever created -- have been the star of Disneyland and present in every toddler's toy collection? 
 
 A rare and long-lost silent film, "Sleigh Bells" from 1928, has just been rediscovered in the British Film Institute (BFI), which stars Oswald, the Disney star who never was. 
 
 "Sleigh Bells" was made by Walt Disney and fellow animator Ub Iwerks, but the rights to the character Oswald were owned by Universal. Following a contractual disagreement, Disney and Iwerks stopped making Oswald films and went on to create Mickey Mouse. 
 
 "There's a good argument to be made that had Walt Disney not fallen out with Universal over contracts, he would have gone on to make 100 more Oswald films and Mickey Mouse may never have been created," Justin Johnson, an Animation Programmer at BFI told CNN. 
 
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– Oswald the Lucky Rabbit, the original famous Disney character before Mickey Mouse came along, appears in a long-lost six-minute cartoon recently found in the British Film Institute's archives, the Telegraph reports. "Sleigh Bells" was broadcast in 1928, but all copies were thought to have been lost and it has not been viewed since. This copy is thought to have been donated to the archive in the 1980s; apparently, no one realized it was the only surviving copy and it was thus overlooked until a researcher recently typed its name into the BFI's new online database while hunting down long-lost titles. It will be fully restored and screened at a BFI facility in London on Dec. 12. An animation programmer at BFI tells CNN this cartoon is "the holy grail of Disney films," seeing as it was the second-to-last Oswald cartoon made before Walt Disney split with Universal (which owned the rights to Oswald) and created Mickey Mouse. "The restoration of this film will introduce many audiences to Disney’s work in the silent period," BFI's head curator says. "It clearly demonstrates the vitality and imagination of his animation at a key point in his early career." Adds the president of Walt Disney Animation Studios, "The Oswald shorts are an important part of our Studios' history, and we have been working with film archives and private collectors all around the world to research the missing titles." (Another, even older Oswald cartoon was re-discovered recently.)