Yes we (or I should say I and a few others) think that only HS30 0003 was built in 1969 and we don't know if it still exists today. From the anecdotal evidence I've seen littered around the web HS30 0004 was built in 1970 and arrived on our shores later in the year for testing.
HS30 00030 was built in 1970 from the date stamps on various components under dash etc.. I got this information from the owner who had some help decoding the Japanese manufacturing stamps on some components of the car. As a side note: The car is not very original anymore, but is actively used in a similar fashion to the cars in the HS30 0002X range were, which is the main thing.
It appears to me that cars under HS30 00100 are likely to have the earlier style Nissan 2400 OHC valve cover and those after that didn't. I know that HS30 00051 and HS30 00084 do have the early style valve cover. So I assume cars before and up until HS30 00084 did, but I'm not sure if cars after that did also and when the cut off point was.. Hence the reason I asked, since Dimitri's car HS30 000121 has the regular Nissan OHC cover. So somewhere between HS30 00084 and HS30 000121 the valve covers changed.
Both Locky's (HS30 00149) and my (HS30 00150) didn't have the earlier cover. More info here:
http://www.viczcar.com/forum/topic/13493-nissan-2400-cc-valve-covers-and-hs30-build-cars/
I also have reason to believe that some of the very first HS30 cars were used as dealer demo cars and not available immediately to the public, so that would mean cars like yours may have been the amongst the first purchased by Joe Public, this is at least what I can deduce from the information at hand so far. It would be great if someone working for Nissan Australia at that time and had an interest in early S30z's could confirm this though.
Certainly Locky's thread about Harry who bought HS30 00149 new seems to indicate that also. Since Harry went onto the waiting list.
http://www.viczcar.com/forum/topic/5319-lurch%E2%80%99s-%E2%80%98early-girl%E2%80%99-240z/