al,
I did have a chance to examine the Lefever. The barrel sets are all 12 ga. Barrel set 19537 measures .698 at the muzzles of both tubes. Set 32665 are .708 at both muzzles. Set 31263 are .720 at both muzzles. So I'm guessing that the original owner wanted sets with modified and cylinder chokes, to go with the original full choke set.
I attempted to take some more photos of it, but the lighting was not good and the pictures are not much better than those already posted. Though, I do have some shots of the gun from different angles.
The gun is available for purchase. Anyone interested can PM or email me for the current owner's contact information.