Sought the Boards advice some time back and finally acquired a graded Lefever. It's a C-grade, S/N 9308 (1886, I believe) two-barrel set. Keith Kearcher rebrowned the damascus barrels, did a buttstock transplant and convinced me to leave the colors on the action alone. The barrels are 30 and 28 inch. The shorter barrels carry another serial number, F 1188, as well as the S/N of the gun, but no grade letter on the flats. Grateful for views on the second barrels.
The gun weighs at 8-1/2 lbs with the 30-inch barrels on. Those barrels are 45-50 thou. The shorter barrels save several ounces. They are 25 thou at the thinnest some distance from the breech. Have not yet fired it, but I have my gaugemate gold inserts out for possible use this weekend.
Pictures:

Lefever C 1886 10 gauge Damascus

Action with Cocking indicator

Bushed strikers

Patents

Two Barrel set

Buttstock Transplant