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Sold for 7s (say £7 in today’s money) when they were made in 1962, standard versions of these models would normally go for around £20 to £30 at auction.

“These were rather different,” explained Vectis Dublo expert Julian Rowse, “because they were for export and the boxes were complete with export labels and numbers.”

As a result, the tankers sold at £600. “In effect,” said Mr Royse, “the collector paid several hundred pounds for the cardboard boxes.”

Another rare marking accounted for the record £1400 which secured a mint and boxed 0 gauge Exley K6 travelling post office from the 1930s or ’40s.

“You quite often see these in LMS maroon livery,” said 0 gauge expert David Nathan. “But this was the first I’ve ever seen in LNER teak livery.”