My 70 Convertible, same-same, 514883, number same location as yours, mine is a 0F build 10-20-69, if you are a 0F also
ours were built pretty close together, if I may ask what was your build date. I have bought and sold a few top loaders that
came with the 0F and the 100,000 designation serial numbers goes to show you Ford and LM may have done things different.
I sure enjoy everything this Forum has to offer
70_Conv_4sp (Keith)