I can't speak for Flatapple's blade, but mine is nearly 5/16" thick at the bolster. But I confess: this knife has little practical use! The first and last occasion that I thought it would be useful, was in the butchering of a moose. The blade, though razor sharp, is definitely the wrong shape for literally any cutting jobs, unless you are letting the life out of some critter. A butcher knife is WAY more practical.
And I think the design may be a relic of the Civil War era, or even prior. There may have been a few who carried such a knife in the era we attempt to depict in CAS, but it is more appropriate for the Plainsman era.
But Flatapple: it is a lovely knife!