Unlike UK Beatles releases, in which both 'mother' and 'stamper' codes are accommodated within the runout-matrix information, the bulk of Australian vinyl only has a matrix number. The lack of stamper codes, or other vinyl-dating information, makes it near on impossible to date pressings/labels beyond the approximate date of a label-style transition or knowledge of when a new cut became available. Compounding the problem is the habit of label typesetters of informally altering font-size, font-style, leading and kerning of one or all of the non-permanent text blocks, meaning that a title label with an italicised-tracklist text has nothing at all in common, date-wise, with an italicised-tracklist label of any other title.
However, with some interrogation of individual labels, one can roughly determine a range in which a title was pressed. This page provides some contextual history and outlines some key content changes that will help you find tune the dating of your pressings. However, one caveat remains: existing stock on hand could mean a title with certain label features may have been pressed much later than the label would otherwise suggest.
A BRIEF HISTORY OF AUSTRALIAN MECHANICAL ROYALTY COLLECTION SOCIETIES
Although music publishers had operated in Australia and New Zealand for many years, it was not until April 1956 that they combined to form the Copyright Owners Reproduction Society Limited (CORS). CORS was formed primarily to promote and protect the interests of parties owning or controlling rights of mechanical reproduction in Australia and New Zealand. Mechanical reproduction included such means as records, tapes, video recordings and cinematograph films. The J. McFadden Agency operated as the agent for the members of CORS in the licensing and collection of royalties for sundry usages of mechanical rights.
In November 1973, CORS changed its name to Australian Music Publishers Association Limited (AMPAL) and for the first time formalised the existing licensing and collection practices. In January 1975, AMPAL formed its own division, the ANZ Music Copyright Agency (ANZMCA), taking over the activities formerly carried out by the J. McFadden Agency. The responsibilities and duties of ANZMCA included: the licensing of mechanical rights and collection of royalties in respect of sundry mechanical usages; the supply of information to various members of the public and industry, particularly in regard to the identification of owners of copyright in particular works; and, the direction of enquiries to the relevant music publishers. In January 1980, AMPAL established Australasian Mechanical Copyright Owners Society Limited (AMCOS) along the lines of overseas mechanical copyright societies such as the UK's aptly-titled Mechanical-Copyright Protection Society (MCPS). Existing ANZMCA funds were transferred to AMCOS. To this day, AMCOS controls the right to reproduce musical works by mechanical means and collects royalties for the mechanical reproduction of its members' works. The amount of money paid is either the statutory mechanical rate or a rate as negotiated between the record company and music publisher. It's worth noting, though, that unlike many overseas societies that collect and distribute all of the royalties derived from mechanical reproduction, local major music publishers insist on direct payment from the major record companies of royalties payable in respect of the manufacture and sale of records/tapes/discs, meaning that for these publishers AMCOS collects only the secondary sources of mechanical income that the publishers find uneconomic to collect themselves.
ROYALTY STAMPS
Historically, once an Australian record company decided to reproduce a recorded work, it was obligated to locate the appropriate copyright owner and purchase stamps representing the amount of royalty payable for each record it planned to produce. Prior to 1957, the copyright owner would generally provide adhesive paper royalty stamps that the record company would adhere to each record label (or pianola roll or cylinder box) to signify that the royalty had been paid. Commencing 1957, most Australian record companies printed the stamps direct on the record labels, with the J. McFadden Agency collecting the royalties (for sundry usages of mechanical rights) on behalf of members of the Copyright Owners Reproduction Society Limited (CORS).
Where a copyright owner could not be located in time to meet the production schedule, the record company would apply a "Copyright Control" stamp, or, in the case of Beatles releases, a "Parlophone Control" stamp. If/when ownership was subsequently claimed, the correct copyright owner would be credited when the labels were next reprinted.
Labels printed for EMI (Australia) generally displayed the royalty stamp(s) to the left of the spindle hole.
In late 1967, Castle Music (one of EMI's two music publishing subsidiaries, the other being Belinda Music) replaced its text-based royalty stamp with a new royalty stamp, shaped, coincidentally, like a castle. The first 'new' Beatles release with this logo was the (stereo) Greatest Hits Volume 1 LP in February 1968.
Following the introduction of the Copyright Act 1968 and Regulations on 1 May 1969, EMI (Australia)—and all other record companies—ceased printing royalty stamps on labels from 1 July 1969, the start of the new financial year. The requirement to print the name of the copyright owner beside each track, however, continued until the end of local vinyl production. It should be noted that EMI (Australia) didn't always get it right, and examples of a number of LPs exist (most notably Please Please Me) where label reprints were required due to incorrect publisher details.
Between July 1969 and September 1969, EMI (Australia) labels had nothing printed to the left of the spindle hole. Commencing October, labels would have the speed and matrix number moved to fill the 'gap'. See image below for illustration.

