Rotary-linear actuation assembly (10, 110) comprising a casing (25, 125) with which there are associated: - an output shaft (14, 113) arranged coaxial with an actuation axis in a translationally and rotationally movable manner; - at least two actuators, of which a first actuator (11, 111) is adapted to impart a translational movement along the actuation axis on the output shaft (14, 113) and a second actuator (12, 112) is adapted to impart a rotary movement around the actuation axis on the output shaft (14, 113); and - at least one position sensor (30, 130) adapted to detect an instant position of the output shaft (14, 113) inside the casing (25, 125) and mounted in a rotationally fixed manner about the actuation axis and in a translationally fixed manner along the actuation axis, and faces at least a portion (14b, 113a) of the output shaft (14, 113); - wherein the at least a portion (14b, 113a) of the output shaft (14, 113) bears, on the outer surface thereof, a mark (31, 131) that extends over at least an angular portion around the output shaft (14, 113) and along the output shaft (14, 113) over at least a length substantially corresponding to a maximum stroke travelled by the output shaft (14, 113) under the action imparted by the first actuator (11, 111); - wherein the first and the second actuator are arranged in a mutually coaxial and concentric manner, the mark being obtained on at least a portion of a jacket surface of a magnetic rotor mounted on the output shaft associated with a radially outermost actuator out of the first and the second actuator; wherein the mark is formed on the jacket surface of radially outermost magnetic rotor mounted on output shaft on a coating film coating the outer surface of radially outermost magnetic rotor. - an output shaft (14, 113) arranged coaxial with an actuation axis in a translationally and rotationally movable manner; - at least two actuators, of which a first actuator (11, 111) is adapted to impart a translational movement along the actuation axis on the output shaft (14, 113) and a second actuator (12, 112) is adapted to impart a rotary movement around the actuation axis on the output shaft (14, 113); and - at least one position sensor (30, 130) adapted to detect an instant position of the output shaft (14, 113) inside the casing (25, 125) and mounted in a rotationally fixed manner about the actuation axis and in a translationally fixed manner along the actuation axis, and faces at least a portion (14b, 113a) of the output shaft (14, 113); - wherein the at least a portion (14b, 113a) of the output shaft (14, 113) bears, on the outer surface thereof, a mark (31, 131) that extends over at least an angular portion around the output shaft (14, 113) and along the output shaft (14, 113) over at least a length substantially corresponding to a maximum stroke travelled by the output shaft (14, 113) under the action imparted by the first actuator (11, 111); - wherein the first and the second actuator are arranged in a mutually coaxial and concentric manner, the mark being obtained on at least a portion of a jacket surface of a magnetic rotor mounted on the output shaft associated with a radially outermost actuator out of the first and the second actuator;