Incredibly, files unearthed at the Royal Mint revealed the two brothers were still at loggerheads over the issue just weeks before George’s death.
The documents – dated December 1951 – reveal Edward was still making enquiries about his penny at this time but would again be disappointed.
King George VI died on February 6, 1952, and though Edward survived him by 20 years, the penny would always elude him.
Exactly what happened to the penny over the years is shrouded in mystery, but historians believe an American collector may have purchased the coin from the Royal Mint at a date unknown
In 1978, it surfaced at auction fetching £25,000 before being sold again in 2019 for £133,000.
The most recent £200,000 appraisal – by the London coin dealer A. H. Baldwin & Sons – means its value has shot up another 50 percent in just two-and-a-half years.