The event began with more than 100 cars setting off in the rain on the Sporting Car Club of Norfolk's Midsummer Classic Car Run around 70 miles of the county's roads.
Then the classics lined up along the High Street, spanning generations of motoring from the 1920s to the present day.
Event organiser Chris Edwards, from Watton Town Team said: 'We're very pleased with the turnout, incredibly pleased, we had a shaky start with the weather, we had a downpour at 9.30am, but the street has now filled up again.
'I can't say I've ever seen more people in Watton High Street.'
Watton mayor Ken Birch said: 'It's absolutely fantastic, Chris Edwards has done a fine job. They're all fantastic motors, they're all well kept.'
Some 150 cars took part in the rally, with another 125 vehicles on display in the High Street.
Dennis and Olive Ward from Lenwade pulled up in their blue 1932 Rolls Royce Landaulette.
Mr Ward, now 84, has been in the motor trade since he left school at 14 and still runs Lyng Garage.
'We've got a lot of old cars but we like Rolls Royces,' he said.
Dave Walton, from Carbrooke, arrived behind the wheel of a P-reg London taxi owned by wedding car business Brecklandbelle Classic Carriages, with 284,000 miles on the clock.
'There's some beautiful cars here,' he said. 'People love the vintage cars, it's great to see them out.'
Alongside the vintage Austins and Anglias, the Rileys and the Triumphs, there were performance cars, kit cars, bubble cars and a handful of immaculate VW campers.
Visitors to the event, held in association with the EDP, were asked to vote for their favourite in a people's choice ballot.
It was won by a 1953 Sunbeam Alpine, restored by John Simmons, from Saham Toney.
Second was a red 1960s Triumph GT6, restored to showroom condition by Paul Sayer from Swaffham.
Third was an Austin A40 Dorster, converted into a bright yellow street rod by John Stearman, from Hempnall.
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