save-buffer-coding-system

save-buffer-coding-system is a variable defined in `files.el'.
Its value is

nil

• Automatically becomes permanently buffer-local when set.

Documentation:
If non-nil, use this coding system for saving the buffer.
More precisely, use this coding system in place of the
value of `buffer-file-coding-system', when saving the buffer.
Calling `write-region' for any purpose other than saving the buffer
will still use `buffer-file-coding-system'; this variable has no effect
in such cases.