The part # on the outside door handle is marked PT 1963 along with Sash Controls Inc. On the inside handle the markings are 1060-1943.
The locking mechanism on my patio door broke and I need to replace it. The two visible numbers are1060-1943 (inside handle) and PT 1943 (outside handle). The latch on the locking mechanism was cast from pot medal and cannot be welded.
![Sliding handle](/images/pictures/2017/08/103903.png)