This window latch, we are sure, was for one of those houses built in the early 20th Century that had flashed copper hardware throughout the house—down to the window sills. This window latch appears to be new-old-stock, however. It is un-used.
There are two pieces to this latch, the turn latch and its keeper. Both pieces measure 2 1/2 inches long. The latch is one inch wide. The hole centers are at 2 inches. The keeper is only 5/8 inches wide with hole centers at 1 7/8 inches.
This is a stamped steel latch with a copper coating, flashed with a black lacquer. Strews are included.