The Permanent Portfolio was proposed by Harry Browne in the book Fail Safe Investing.  An excellent modern guide is The Permanent Portfolio: Harry Browne’s Long-Term Investment Strategy by Craig Rowland and J. M. Lawson.

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British Portfolios      ///   AUS   CAN   GER   USA

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Asset Allocation

• 25% Total Domestic Market (UK)
• 25% Long Term Bonds (UK Gilts)
• 25% Tbills/Cash (UK)
• 25% Gold

 

Note: Short Term Bonds are a common substitute for Cash for many Permanent Portfolio investors.