The patio slider was installed approx. 10 years ago by a windows company in Southern California. The only markings are: "Patent pending" and "This End Up".
Thank you.
Karin
Casey from SWISCO responded:
November 9, 2017
Thanks for writing in, Karin. I believe the best match for you would be our 82-238 mortise lock. Take a look and let us know if you agree.