The Truth Hardware (AmesburyTruth) 50 Series Encore Right-Hand Dual Arm Casement Window Operator (50.10) is designed specifically for use in casement windows and pairs seamlessly with AmesburyTruth 14 Series Maxim Casement Window Hinges. Often referred to as a window crank, mechanism, or opener, this right-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 with the stamp "41012" on the arm, though you may also find the markings "41011" or "31876" on the operator.