Anything personal or unseen regarding the Royal Family is also likely to bring in a higher selling price, the expert continued.
He commented on rare letters discussing the Queen and Prince Philip which sold for a staggering sum of money.
“Anything of a personal nature and with a story behind it is always of a greater interest and value,” David added.
“A letter written by Prince Philip during his tour in New Zealand in 1943 sold at auction for £3,000 in November 2020.
“It was detailing his views of the country, and he is renowned for his occasionally outspoken opinions.
“In terms of the pieces produced for public consumption, it is worth looking at who they are produced by.