They were at first believed to be ruined beyond repair, largely because of water damage.
Marley, who died in 1981, would have been 72 on Monday 6 February 2017.
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The tapes were found in a run-down hotel in Kensal Rise, north-west London, where Bob Marley and the Wailers stayed during their European tours in the mid-1970s.
They were discovered when Joe Gatt, a Marley fan and London businessman, took a phone call from a friend, who had found them while doing a building refuse clearance.
From the 13 reel-to-reel analogue master tapes, 10 were fully restored, two were blank and one was beyond repair. Work lasted one year and cost £25,000 ($31,200).
The tapes were recorded on the only mobile 24-track studio vehicle available in the UK then. It was loaned to Bob Marley and the Wailers by the Rolling Stones.
(Source BBC Music News)