Personally speaking, I would not be surprised by anything that Nissan/Nissan Shatai (or any of their family of companies and suppliers) did in the early days of production, and/or in the switchover to superseded parts and new models. The principle of Occam's razor usually applies. I'm not saying it was total chaos, but those were heady days. We are well aware that there was always a certain amount of fettling going on, and we have seen evidence of repaired/re-finished (presumably initially rejected as substandard, then rectified and re-introduced to the parts bins) so I would never say never.
The BaT universe for a car like this is - naturally - biased towards the North American viewpoint. But these are Japanese cars, and it's almost like some of those people forget that. The memories of somebody who sold these cars when they were new, or who has owned fifty of the same type, are always of interest - but I'd rather speak to somebody who was working on the production line. Or better still, many people who were working on the production line...
A perfect example of what I'm talking about has just popped up on that BaT auction:
Jeff Segan has just made comment on the rear bumper forward-edge rubbers, after somebody queried their absence on this car. He might need to tread carefully with a "not used on 1970 240Zs" type statement. It's a little like running with scissors...
After all, what does "1970 240Z" mean. What month? What variant (HLS30U/N/V? HS30U? HLS30? How about Aus and NZ?)? You'll end up dancing on a pin.
The E4100 rear bumper forward end 'base' blocks were seen - for example - on the SLE 0630-911027-U factory sales flyer in 1969 (you know, the red car without a clock, radio or antenna, and with cut-and-pasted emblems) and were a feature on Japanese market cars from the first days of deliveries. Applied somewhat haphazardly in Export market cars, they are perhaps a lesson for us in treating sales brochures as reference points and - indeed - any one of these cars with one-size-fits-all ideas about content and conformity.