Quote:
Originally Posted by speede5
My suggestion is to push the rod through and try a screwdriver to turn the mech. Some wd40 might help. These mechs are quite simple. Opening the hole a bit might help. That knob looks way older than 1956. That’s a 20’s vintage piece.
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Glass knobs were popular from the 1890s to 1940s, but they've been around since. Even today you can buy brand new glass knobs and old-fashioned mortise locks.
BSFan, rather than trying to describe "a 'bit' that goes into that square hole", just post a photo of the back side of the knob. How does it normally lock from inside the bathroom? A push-button? A small switchlever? Push the knob in and turn? Modern privacy locks —and by modern I mean just about anything made in the last century other than a replacement mortise lock—will have the lock mechanism contained in the inside knob, so if you've already got access from the outside as pictured in your photos you should be able to just push the other knob out, stick a screwdriver in the mechanism and turn the bolt to unlatch the door.