Sorry if this question has been asked before, but I tried hard to get the answer on my own. I have a 1964 DJ 1603 that currently has a white date wheel with open 6's and 9's. I'm trying to validate if it should have a silver date wheel instead. I haven't been able to find any older 1603's out there with silver date wheels. Is it possible the white one is correct and not a service replacement? My two early 70's 1601's have silver date wheels, but not this one.