A signed photograph of the famously left-handed former US President is estimated to be worth around $688 (£600).

And that's just the start of Obama's paper-related money-makers. A handwritten letter that he penned to Jennifer Cline, a skin cancer patient who'd recently lost her job, sold for $7,000 (£5.4k) in 2010.

Meanwhile, pencil sketches – including self-portraits – that Obama drew on White House stationery also sold at auction, making $11,000 (£8k) in 2017.