Now, having said all of that. IF I were going to gather precious metals for barter/trade in a WROL scenario? I would look at Gold and Silver chains, chains in which a I can cut links off, something like a "Curb" chain, with easily definable links that can be easily cut with a leatherman. I would look for 18K chains, from places like pawn shops. You don't care about the "Look/Style", just that they ARE gold/silver, and easily cut. What this all infers, is that you become REALLY good at identifying Gold and Silver, either through mechanical or chemical means. Your money would go a LOT further buying pawn chains than something like above, that is manufactured for the express purpose of praying on "fear".
A very long time ago, as a kid, I had access to a very exclusive Club in a far away place. Around the pool was an old (70-700) Asian(ish) dude who was spending his retirement years drinking & reading at the pool while gazing at attractive young female bathers. He had great tolerance for kids & used to tell us tales from his life long occupation: smuggling throughout Asia. For bribery (say two guards on a remote trail) he recommended gold wire which he kept wrapped around his gut) regardless of what else he might be smuggling. "Why?", we asked.
Compact, easily concealed, easy to twist/cut to length & easily dividable. More importantly, the objects of the bribe could determine it was gold (mass & bite test) & knew what they could do with it- hoard, sell, trade. Not so with other commodities such as antibiotics, diamonds, USD etc.