Tom from SWISCO responded:
June 16, 2022
Looks like you might have an old Roto brand set. We don't sell this exact style, but we have some parts that you may be interested in. Take a look at the 82-080 handle set and 82-238 mortise lock and see how well they compare to the space available in your door. Now, these are a little different in terms of design, so there are no guarantees. But right now I think they're going to be your best bet. See what you think! Dimensions for 82-080
Alternate view of 82-238
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