Australia 1963 Threepence Thin or Lightweight Planchet Error

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Coin Type:Australia Threepence
Grade:UNC
Year:1962
Mint:Melbourne
Metal:50% silver, 40% copper, 5% zinc, 5% nickel
Obverse:Elizabeth II (Gillick)
Reverse:Wheatstalks and Ribbon Device (George Kruger Gray)

1963 3d struck on an underweight or thin 1.33g planchet. Note thinning to left of obverse from about R of REGINA clockwise to almost the D of F:D.

Supplied in an archival Saflip.