The project continues... the only additional reference I have found so far in in Courier no 48, "The QV Lithographed Postcard" by John Shepherd, which deals with the 1903/4 emergency printing.
Summarising Mr Ingles in Tinsley: The original printings of this card were by De La Rue. There were three plates, distinguished by the distance between the stop after "SIDE" and the edge of the stamp image. For Plate B the distance is 5.5 mm and for Plates C & D the distance is 6 mm.
The subsequent Tasmanian printings are of generally poorer quality than those from De La Rue and show many variations. I have found that the most reliable way to pick the De La Rue printings is by looking at the hair on the back of the unicorn's head through a magnifier. If you can see individual hairs or strands, it's a De La Rue.
Mr Ingles quotes measurements of the card itself to help identification. I haven't found this to be reliable - maybe the paper shrinks or expands very slightly over time. The "stop to stamp" measurement has to be taken carefully. If your ruler is aligned to the bottom of the instruction line ("THE ADDRESS......") the difference between the two varieties is clear.
For plates C/D, Mr Ingles gives an earliest date of 3 Aug 1885. The attached example is Plate C/D and is dated 5 April 1885. I had no idea of this when I bought it on eBay - you never know what will turn up.
The addressee, Miss Lucy Bisdee, was an ancestor of the Tasmanian MP Mr Lewis Bisdee (toastmaster at our wedding).

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