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1. A horological or jewellery hinge assembly comprising an outer hinge with a first knuckle and a second knuckle which are integral with an outer base plate and including respectively a first bore and a second bore which are aligned along an axis, and further comprising an inner hinge with a single knuckle integral with an inner base plate and insertable, with minimum clearance, between said first knuckle and said second knuckle and including a third bore able to be aligned along said axis with said first bore and said second bore in an operating position, where said outer hinge and said inner hinge are mounted so as to pivot relative to each other about a screw, through, on the one hand, a guide tube for said screw arranged to be inserted into said first bore and including first angular indexing means arranged to cooperate with complementary first angular indexing means that said outer hinge includes at said first knuckle, and secondly a tube-nut intended to be inserted into said second bore, said screw including a head for axial immobilisation thereof in said guide tube and a thread intended to cooperate with an internal thread in said tube-nut, the cooperation between said thread and said internal thread making it possible to adjust the axial clearance or tightness between said outer hinge and said inner hinge, wherein said tube-nut includes second angular indexing means arranged to cooperate with complementary second angular indexing means which said outer hinge includes at said second knuckle.
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