Window lock 3" height, 0.75" width

Thanks for your post! This window lock is similar to a few we have. To narrow down the correct replacement, I'll need to see it removed from the window. Unfortunately, I am not able to see how the lock installs.

Please let me know if you have any additional questions!

Thanks for the additional photos. Your window lock can be replaced with either the 90-310 Window Sash Lock or the 90-063W Acorn Window Sash Lock. To determine which of these is the best replacement match, carefully look over the dimensions one the website and compare them.