Screen latch, possible mercury window

A professional from Manchester says:
i have a customer looking for about a dozen of these screen latch parts. They think they are from the Mercury Brand..

hope the pictures help !
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Emily from SWISCO responded:

Hello there!

Thank you for reaching out to us. The parts in your photos remind me of the 70-173 thumbscrew and 70-210 flush clip. Carefully review the specifications for each and see how they compare with yours. 

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