Roto has several versions of this handle that look similar
The Roto OP06-7814 X10 Lock Out Feature folding handle with a different grip than the OP06-7800

Application: Awning and casement windows
Length: 4-1/8 inch
Spline Size: 11/32 inch
Knob End: Round
Color: Black
Markings: OP06-1561 underside of handle

Related Roto Handles
Roto OP06-7800 X-Drive Standard Folding handle
Roto OP06-7804 X6 Folding handle with Round grip, Different than the OP06-7800