Mark 55H rebuilt gear case, rebuilt in 2015 with new bearings, seals, cone nut, bearing carrier, prop shaft, water pump cartridge, "L" ring and seal, nuts, tab washers,vent and fill screws in a good housing with nice threads.  The drive shaft is used but in good condition showing a little wear on the upper splines. The gears show some wear I would estimate 50% life left, the impeller was in excelent condition. Turns over smoothly.