I have a DZ block from the same time period (Dec 17, 1968). The vin derivitive is down by the starter, but not legible. Even with a lupe, I can only make out an "N", and possible the very bottom of a "1" or a "7" along the way. One of the guys stamping these during that time period just didn't hit it very hard. My guess is that there would be SOME evidence of the derivitive down by the starter. The guy I bought my block from had said the same thing as this guy, that there is no other stamp. On mine, part of it is there, just very faint.