385 series I believe

A quick learner from Minneapolis says:

Single hung no tilt window. This mounts on the inside track of the top part of the window sash. I believe one of the videos on this site refers to something similar as a top sash guide, except mine doesn't mount on top of the window, but inside inside the track and hidden from the top

It's size is 5/8" by 2 1/4" long

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Tom from SWISCO responded:

This part is indeed a top sash guide. Specifically, it looks like our 18-008. Check it out and let me know what you think.

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