Chris - what Schweppes P/N best fits our lock?
The Schwepper latch appears to be GSV #3801 SZ or similar -- although with only an approximately 35mm backset:
Mortise sliding door lock for cylinder complete stainless steel | GSV-No. 3801 SZ (schwepper.com)
The thumbturn cylinder appears to be #391 or similar with the large knob (#5602) option, and approximate measurements are:
- Inside (not counting the knob) = 25mm
- Outside = 35mm
Thumbturn cylinder Archive | Schwepper - Lock and hardware systems for shipbuilding / Railway / Repower / Industry
Much depends on actual measurements, though, and I haven't removed the parts from the door frame to do those measurements yet. Probably do that soon after we arrive home, probably a couple weeks...
Given the actual measurements, The Brass Works people in Florida can sort out the details.
-Chris