Hi Kats,
The data I have is all from user submitted data or from cars I've managed to uncover chassis no.s for, usually from for sale listings or from licence plate reverse look up's. So it's patchy at best.
But here is what I can tell you.
HS30-01501 was on TradeMe.co.nz in NZ recently for sale (May 2020), according to the then owner, it sold new in Queensland Australia.
Photo of how it looks now.
HS30 01501
I've tried to determine what is the highest HS30 prefix car before reaching #2000 and the highest recorded number I have is: HS30 01973, I don't have photos of that car, but the next highest car is: HS30 01945 and I do have photos of that car. This car is also Australian delivered. The compliance date (date they arrived and were certified in Australia) seems to be consistently around Dec 1971.
HS30 01945
What I've found is that towards the end of the chassis range, cars were sold in NZ and the UK.
For example:
HS30-01838
HS30-01839
HS30-01843
All appear to have been in NZ.
HS30-01914 was sold in the UK.
I think your guesstimate of 300+ cars is probably fair.
What I noticed with HS30's (In Australia anyway) is that the 72 model year is by far the rarest model (compared to 70,71 and 73). I am guessing this is because Nissan ramped up production of Fairlady 240Z and Fairlady 240ZGs around this time period and perhaps made less HS30's for Australia, NZ, PNG, South Africa, UK, Hong Kong etc..
I do try and collect HS30 data outside of Australia, but getting VIN #s from Japanese cars is always a challenge as @HS30-H has informed me of strict privacy laws (I actually think this is a good thing) and to be fair I think the bulk export HS30s did arrive in Australia out of all RHD export markets and so that's where I've found most of the data.
As you know I also own HS30 10552 which is a "72" model, but the date stamps on the seat brackets indicate Dec 71 manufacture date.