[The Duke]

I tend to prefer (slightly) the coins (actually 'rounds') to the bars. The rounds seem to to be more elaborately, ornamentally, engraved, which I believe gives them a little more credibility.

Also, government-minted "coins" often cost only slightly more and, because governments tend to be aggressive about locating and prosecuting counterfeiters, they receive the highest degree of trust.

I became aware of the metals vendor "Gainesville Coins" when I read many 5-star reviews from their satisfied customers. I have no trouble recommending them.

I do believe, however, that secure storage of metals and the, IMHO, high potential for government confiscation, should cause the prepper to consider other ways to store the value of their money. (As an example of thinking out-of-the-box sometimes I think the best investment for difficult times is to buy a tow truck.)

[Yosemitest]

I know you you mean about out of the box old vehicles.
Anything earlier than 1967; points, plugs, and condenser.
But you need to keep them in running shape, and today's fuels can really destroy an older carb vehicle.