Truth 50.60.00 Encore Series Split Arm casement operator.

The Encore Series split arm operator is designed to operate sash sizes from 20 to 32 inches wide and up to 72 inches tall, weighing up to 73 pounds

Window Type: Wood and Vinyl Casement
Link Height: 39/64 inches (15.4mm) 
Link Length: 4-7/8 inch
Link Rivet to stud post hole: 4-7/16 inch
Link: Mounted on top, Offset Down, Straight
Handing: Left Handed (when viewed from outside of house, window hinge is on the left side of the window)
Color / Finish: E-Gard
Sold: Each, Window Crank Operator only - No Handle or cover (see below)

Related Parts:
Cover and Handle: use Tango folding handle and cover - 55308
50.60.00.212 - Encore Operator, No Cover, Right Hand
55093 - Maxim Operator with Built in Cover, Left Hand
55094 - Maxim Operator with Built in Cover, Right Hand