Abstract: An adjustable sight mechanism for an archery bow has an elongated base, a sight support assembly mounted on the base and a sight assembly mounted on the sight support. The sight support assembly includes a sight carriage block with a turret unit mounted on the block for rotation about the axis of a stub shaft projecting from the turret unit into a passage through the sight carriage block. A slot is provided through the length of the passage, and a set screw is arranged to squeeze the turret shaft. An anchor block that can be locked to the base has a flat face against which a vertical adjustment knob bears. The flat face has in it a series of seats arranged on a circle, and the knob has a spring loaded detent both to inhibit rotation of the knob and to permit a click adjustment.