Proof and Specimen

Bullion Coins = 普造幣

Uncirculated Coins = 沒用過的幣, 全新

Specimen Coins  = 特造幣, 在廠已入盒保護, 所以多數是 Uncirculated

Proof Coins = 特造鏡面幣, 又叫精造幣

Proof like Coins = 似是 Proof 幣, 所以不是 Proof Coin

所以買幣時, 須細心閱讀解說 !

wiki.answers.com/Q/How_do_you_know_if_you_have_an_Australian_specimen_coin

I am not sure what you mean by a specimen coin, but there are two possibilities.

Possibility 1 - A specimen coin is a coin (or bank note) struck as a trial and will be marked clearly in some fashion to indicate that it is a specimen and not for general circulation.

Possibility 2 (and most likely) - When a new years coinage is released, the Royal Australian Mint also produces a variety of coins not intended for general circulation. These are produced for collectors and are usually minted with specially prepared dies as mint uncirculated "specimens" of the latest coins. They are presented in protective packaging and are labelled indicating that they are an uncirculated "specimen" set or a "Proof" set or some other high value coin set often made from precious metals.