Nice bullets but I believe your 429421 is from the 1960s. That's when they went to the round bottom grease groove as opposed the Keith's original square bottom. I purchased that same mould as a kid about 1962 and a letter from Mr. Keith advised I had "been robbed" as Lyman ruined his design. Many years later I acquired a CBI Original Keith with square cut groove and truthfully I can't tell any difference between the two as to accuracy. These days I use the LBT mould more because it it is easier to cast with!
