1955 Mortise sliding glass door latch

Thanks for posting. This is a very old mortise and the only thing we sell that might work is 82-223, which has a square face and a 90 degree hole (as opposed to a 45 degree, which is typical).

With that being said, the hole from the 82-223 has the same position as most modern mortise locks. If that position is an issue then it likely wont work. I regret to say that I don't know of any mortise on the market today  whose installation holes are set up like yours.

Alternate image for 82-223

I apologize we can't be of more help.