Several years ago I downloaded all of the scanned documents from the National Archives for those Post Offices in my area of collecting that were available.
This involved many hundreds of documents, which I am still going through.
Last night I was looking at Duramana, which was allocated numeral 1209 in the sequence, and found this document:

The original source is here:
https://recordsearch.naa.gov.au/Sea...px?B=7477020Just jump to page 85 to see it.
Checking Hugh's book, I saw that 1214 was allocated to Barney Springs, which was closed in 1885 but was illustrated with an 1897 1d. Hugh even has a note under 1214 saying "Re-opened/reallocated?".
Given the opening dates, I think the sequence should be:
1208 Wimbledon (proving piece sighted)
1209 Havilah (opened 16/8/1883)
1210 Barney Springs (opened 1/9/1883)
1211-1213 as listed
1214 Duramana (opened 1/9/1883)
This will alter the rarity ratings for Barney Springs and Duramana to NNR and RRRRR respectively.
