On most of those, the C-bout back linings are bandsawn poplar or beech. They are extremely wide, the theory being that this would help prevent seam openings. It does work, but we all know that's a bad idea for a couple reasons. You will want to replace those with normal linings. And you might consider a different back bracing scheme. The old "stair step" is reviled for making these basses sound thin and respond slowly. No sleep for you in the year ahead!
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