Training stamps are commercial stamps that have been hand cancelled with
"CANCELLED SPECIMEN ONLY" &
"SPECIMEN ONLY", they were used between 1967 and early 1968 to teach postal workers to understand the new decimal currency postal rate.
These overprints were added to the postage stamps by a coarsely made rubber stamp, the 30 cent Waratah stamp seems to have the overprint done in pen.
Although these stamps were never meant to see the light of day outside the post office, they have frequently found their way into the hands of collectors.

Queen Elizabeth II
Native Flowers

Native Birds

Marine LifeEven though I was told it is a nearly completed set, I have no idea what the remainder is, though all that needs to be done is to see which stamps are not included in this set from dealers that may have some.
Unfortunately, the stamp dealers in close proximity (Sydney CBD and Blacktown) do not stock any, and the stamp specialist I bought these from, said that was all he had, and these came as is from a collection he bought.
All stamps are MUH, if you know of a stamp dealer who sells these type of stamps, please let me know.