window lock

A contractor from Philadelphia says:
Hello, I am desparately trying to locate more of these window locks. I have about 20 windows and only 10 or so of pieces that go on top of the square metal piece. I have included two photos of the actual levers (one on its side and the other upside down so you can see the square insert). I cannot tell who the manufacturer of the windows are. Thank you for any help you can offer.
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Tom from SWISCO responded:

Sure, take a look at our 90-247 Peachtree lock. This looks like a good match for the hardware in your photos.

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