This is the most common size and style double-hung window lock found in the United States today. This pattern is unchanged for many years. Shown above in polished solid brass.
Base dimensions 7/8" x 2-1/2".
Strike size 5/8" x 2-1/2".
Center to Center screw hole measurement is 1-15/16" for both lock and catch.
Other finishes shown below from left to right:
Flat Black on Brass (No Longer Manufactured), Antique Satin Nickel, Satin Chrome, Bright Nickel, and Polished Brass.
Finishes not Shown:
Antique Brass, Polished Chrome, Satin Nickel, Aged Bronze