The one in the circle is the body style, the one under the flange on the center section is the assembly date of the center. the one on the tube is the assembly date of the whole rear axle. The "A" I think is the line it was produced on (not 100%on that). the dab markings are various tightening and fill markings. The under side of the pinion large stripes are gear and suregrip identifiers markings. The one on the right tube out by the u bolts is the part number for the rear axle assembly.
Dave