The modern interpretation of the asset allocation that the Talmud advocated millennia ago has a alternative and perhaps more correct interpretation of one third in-hand, one third buried in the ground, one third in commerce. The context within which that was recorded was in regard to safety/security.
With that in mind, one third in-hand in modern day times might be gold. Commerce = stocks, buried away = government treasuries.
Prior to the ending of the gold standard in 1933 the assets might have been hard US dollars in-hand, stocks, and gold buried away into treasuries. Savers with surplus gold (or silver) coins were more inclined to hide (deposit) that gold with banks/treasury, which in turn earned interest, and where that gold could be retrieved (withdrawn) at any times within the depository terms/conditions.
As a form of "inflation bond". capacity to maintain purchase power, in terms of 3.333% 30 year SWR (return of your inflation adjusted capital via 30 yearly instalments), that historically had a 100% success rate, at least from a calendar yearly granularity perspective. For some 30 year cases ending with a residual value after 30 years of 3.333% SWR with multiples of the inflation adjusted start date portfolio value still available, as the data since 1794 in the following image indicates
Similar backtest for British based data indicates a similar overall tendency, but with a single failure of a 1910 start year, where it fell a year short before all of the portfolio value had been spent relative to a 3.33% SWR, lasted just 29 years instead of 30. Pretty much aligned with the collapse of the British Empire, loss of the Pound as a world primary reserve currency, expense of literally blowing away massive amounts of money (WW1) ...etc.
On that basis, with cash buried away into the treasury, gold should be in-hand, or at least readily to hand such as buried, ideally within land that you own/control. At 2000/ounce recent prices a standard gold bar/brick is $800K value, so even at a upper 7 digit figure that's just 11 bricks, for a individual of perhaps $40M wealth, and where their private residence is more than likely capable of having 11 bricks buried/hidden away discreetly.