Australia 1971 50 Cent Obverse Strike Through Error

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Coin Type:Australia 50c
Year:1971
Mint:Royal Australian Mint
Metal:Cupro-Nickel (75% copper, 25% nickel)
Obverse:Queen Elizabeth II (Ian Rank Broadley)
Reverse:Echidna (Stuart Devlin)

Interesting 1971 50 cent with the obverse struck through foreign material (perhaps oil) resulting in an extremely poor strike. Most of the obverse lettering is completely missing.

Supplied in an archival Saflip.