Replacement window hardware

I'm afraid that I don't recognize this lock. We may have a good replacement, but before I recommend anything I would like you to tell me the precise distance between the two screw holes, center-to-center. I can't tell what that is from just a picture of a tape measure. 

Once I have that size I will do my best to find something in our inventory.

Thank you. We sell two locks with that hole spacing: the 90-274, which has a backset of 11/16", and the 90-180, which has a backset of 3/8". Your next step should be to check your own backset to determine which of these would be the better option.

Dimensions for 90-274

Dimensions for 90-180