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"I built my house and educated my children all from the proceeds of wristwatch repairing," he says.

In one of the videos, a fighter displays his wristwatch to the camera, showing the date as 25 October - and repeating it out loud - the date of the massacre in al-Seriha.

Items included the American singer and actor's silver ring, a part-smoked cigar, his father's wristwatch, and an elaborate, white jumpsuit, which sold for £400.

In households, they have become commonplace, powering remote controls, hearing aids, toys, electric tea lights, wristwatches, greeting cards that play music and other familiar items.

Not once did he check his phone or wristwatch as the young photographers discussed their work.