The Truth Hardware (AmesburyTruth) 50 Series Encore Left-Hand Dual Arm Casement Window Operator (50.10) is expertly designed for use in casement windows, working seamlessly with AmesburyTruth 14 Series Maxim Casement Window Hinges. Often referred to as a window crank, mechanism, or opener, this left-handed dual arm operator supports window sashes up to 96 lbs (43.5 kg), with widths ranging from 24" to 40" (610 mm - 1016 mm) and heights up to 84" (2134 mm).

This operator is commonly identified by the stamp "41011" on the arm, though it may also feature the marking "31876" on the operator.