The bottle was discovered during a special behind-the-scenes tour of Edinburgh's King’s Theatre.
It was found by theatre photographer and historian Mike Hume while on a private tour.
The bottle was hidden inside the plaster crown at the centre of the proscenium arch, right above the stage.
Mike and the Capital Theatre's team identified that the piece of paper inside the bottle was dated to 1906 - the same year the King’s Theatre opened.
It contained a list of contractor names giving details of the architects, draftsmen, plasterers and journeymen who worked on the theatre construction.
Mike, who is one of the theatre's donors, said: “When the builders of the King's Theatre placed this trinket at the very centre of it, they intended to honour the local people who built the theatre.
“It’s astonishing to think that this time capsule of history has been hidden in plain sight for nearly 120 years, silently...