Tigging that cracked chainstay, or brazing over it, will likely be a temporary fix as the inside of the tube will be bogging and you can’t get in to clean it. Replacement of the chainstay is the way to go. Depends on the dropout design but generally it’s an easy job.
It looks like the dimple is larger than is required too so replacing with a less dimpled stay would mean it was stronger and less likely to go again in the future.
I was hoping you might have some ideas, thanks for the insight. Many options to consider. Maybe I'll message All-City first and see what the response is. It's a shame because that paintjob IMO hasn't been matched since with newer models.
Tigging that cracked chainstay, or brazing over it, will likely be a temporary fix as the inside of the tube will be bogging and you can’t get in to clean it. Replacement of the chainstay is the way to go. Depends on the dropout design but generally it’s an easy job.
It looks like the dimple is larger than is required too so replacing with a less dimpled stay would mean it was stronger and less likely to go again in the future.