A red Namiki fountain pen from the 1930s is expected to sell for £42,000-60,000 ($64,660-92,373) at Bonhams.
The lot - produced in Japan - will lead an auction of fountain pens in London on December 14.
It's one of the world's rarest pens, with only 1,500 in existence. Of these only one in 20 is red, further enhancing its desirability.
Ivan Briggs, Bonhams' director of fine writing instruments, explained: "This is one of the most distinguished pens the auction market has ever seen.
"The elaborate, raised takamaki-e work combined with the mother-of-pearl inlay on red urushi background give an unsurpassed radiance."
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