Muzzle Loading 10ga. SxS Question:

[Bruce P Bruner]

I was strongly considering this 10 gauge 34" barreled side by side until I saw this crack in photo #1 (rear center rib). I requested another photo from the rear angle to access how far the crack traveled but no response. I believe anything can be corrected for certain monetary considerations. I don't know for sure how much stress that location takes and how much structural integrity surrounds the area though it looks to be somewhat robust. Logically something stressful caused the crack. Perhaps an easy fix, I don't know.
I was interested in this one because shooting it I wouldn't be at the mercy of the shotshell manufacturers and I would like to expand my collection with a ML SXS.
I believe this one was manufactured in Detroit, MI. in the 1860's by Casper Benard Berger, a very skilled Prussian immigrant (photo #5). I have not yet determined the family relationship to "JJ Berger" found on the barrels. The population of Detroit at that time was 60-70K. The barrels were imported from Belgium.
Certainly not something you see everyday.
Opinions?