This is a right-handed diecast casement locking handle with an offset base found on many contemporary casement windows (as viewed for the inside looking out). The mounting holes are positioned offset of the centerline down the base placing them closer to the window frame edge by 13/16 inch from the tip of the lock to the center of the mounting holes. This handle has an aluminum finish with mounting holes for the handle assembly and the keeper at 1-1/2 inch apart.
Used by many contemporary window manufactures
This contemporary design is similar to a Truth hardware design
1-1/2 inch on center mounting holes
Diecast construction with an aluminum finish
Matching left hand casement operator is Prime-Line part H 3596