Truth Traditional Style 7-1/2 single straight arm casement operator with Stainless Steel Roller Button
They style of housing has been discontinued and has been replaced with the Ellipse Series

Brand: Truth
Style: Traditional
Arm Type: Single, Offset Up
Arm Length: 7-1/2 inch
Roller: 9/16 inch Stainless Steel
Handed: Yes, Left Hand as Shown 
Markings on Base: 45251

Color Options:
White 

Note: Straight arm casement operators arm measurement is from the center of the operator to the center of the roller. See additional images