OutdoorKing Repair Forum Forums Repairs and Maintenance Questions on Engines Questions On Briggs & Stratton Engines Briggs & Stratton crankshafts

first up i just like to say this is a great and informative forum for anyone tinkering with mowers, snipers, chainsaws, etc, a real gem thanks.
now my question here is mainly to do with 3.5 hp B & S crankshafts and the markings on them. I've put a few photos here to illustrate what i'm trying decipher




. all these cranks have he number 700 printed on them on one side along with the B&S logo i also have 1 with 699 on it, on the other side there is 2 digit number and a series of 3 letters and numbers in a stamped square, can any one shed light on the meaning of all these stamps