Copy of production numbers by year table attached.
I wonder if they are including HLS30's in with the HS30's in that chart for these reasons:
1. HLS30's are not listed anywhere on that chart, but make up for a large % of all S30 type cars sold (When I say S30 , I mean all types of S30 (fairlady Z, 240Z, etc), not the actual S30 (the fairlady Z JSM 2 liter model) )
2.
17,892 HS30's made in 1970
41,595 in 1971
61,595 in 1972,
43,584 in 1973,
= 164,666 which seems way off for just HS30's (if excluding HLS30's).
Nissan only sold about 3000 240Z in Australia from 1970 to 1973. Where did the other 161,666 HS30's go?
I think its fairly obvious that included under the table for HS30, are all S30's that had the 2.4 litre engine (that's what the H stands for in the chassis number, it means the car had the L24). Therefor I suspect that chart contains data for HS30's and HLS30's and the (JDM) Fairlady 240z (HS30-H) as well.
So if the chart contain both HS30 and HLS30, and because of the parallel uses of chassis numbers, your assumption that any car with a sub 438 chassis number mush have been made in 1969 is incorrect.
Thanks for posting the chart though, the CSP311 production numbers are interesting.