5 Dollars - Elizabeth II Flamingos birds

Pobjoy Mint, based in Surrey, pioneered titanium coinage in the 1990s and remains the dominant producer of the format — the coloration here is achieved through anodization, a controlled oxidation process that varies oxide layer thickness to produce specific wavelengths of visible light rather than any applied dye or pigment. No two anodized titanium coins color entirely identically, which introduces a degree of individuality unusual in mass-produced numismatics.