Certainteed Casement Window Insect Screen Fastener

A handy person from Brooklyn says:
This clip holds in a window screen for an old Certainteed casement window. The knob, spring and L bar hold in the screen.
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Tom from SWISCO responded:

Hello! We have two parts that may replace this: our 70-050 or 70-050B, depending on what size you need. Look these parts over and let me know if you had any questions. 

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