It all depends upon the assembly plant. Some allocated the PSN at the end of the assembly process, others allocated it when the vehicle was added to the schedule. J142215 was entered into the schedule before J150367, however this doesn't mean the earlier PSN vehicle was finished before the later one. One good example is my Acacia Ridge Picardy red GTS327, body exited the body plant in August but the vehicle wasn't assembled until October as Acacia Ridge missed out on a batch of GTS327 engines (the May 1968 assembled engines). It had to wait until the July 1968 batch got here. So it has PSN, BODY and chassis numbers consistent with mid August production but it wasn't assembled until October 1968, and its GMH engine number is consistent with October 1968 307's from Acacia Ridge.

Body numbers also depend upon the body plant. Some used a sequence for each model, others were a cumulative total for the series or for all vehicles from that body plant, and it changed depending upon when in time we are talking about (like HK is different to early HQ etc).

Edited by user Thursday, 31 August 2017 8:25:26 PM(UTC)  | Reason: Not specified

The 337 was probably a stock order, yours may have been a retail order. I have heard of initial build HK V8 337's (June 1968 build) being sold new in 1969. By that time the car will have sat around (probably outside) for over 6 months with original fluids, Their engine and box were 18 months old by that time too.

Yes, once compliance dates came in 1/70 this problem went away. It was quite possible that someone could have bought say a Pagewood GTS from initial production at Monaro release. At HK runout mid 1969 around HT release there would still have been the odd early HK Monaro still not sold, built before the GTS. Imagine your next door neighbour bringing their new Monaro home, obtained maybe 8 months after your GTS. You look at the chassis number and say "it was built before mine!"