Window tilt latches

A quick learner from Rock Springs, WY says:
Our local window place has been unable to locate these latches. Help us please from late 1970's to early 1980's we think.
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Tom from SWISCO responded:

This is definitely an older style latch, but it appears to be a match for our 26-015. Look it over and let me know if you agree, or if you had any questions! We also sell the 26-016 spring, if you also needed that.

Detail of 26-015
Detail of 26-015

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Anatomy of a tilt window
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