Truth Encore Series Dual Arm, LOW PROFILE, casement operator. 
The Encore series dual arm operator is designed to operate sash sizes from 24 to 40 inches wide and up to 84 inches tall, weighing up to 108 pounds. 

Window Type: Wood and Vinyl Casement 
Link Height: 31/64 inches (12.3mm) 
Bottom Link: Offset - Curved 
Handing: Left Hand 
Cover & Handle: Designed to be use used with Tango folding handle and cover  
Shoe: Square metal clip Truth # 31877 
Track: 14-1/4 inch Truth # 41014 
NOTE: the Standard Profile looks about the same - has 39/64 link height and bottom link is Straight. 

Related Parts: 
50.11.00-RH - Truth Encore Low Profile Operator - Right Hand
50.11.00-LH - Truth Encore Low Profile  Operator - Left Hand 
55308 - Tango Cover & Handle, RH  
55309 - Tango Cover & Handle, LH