[anabab]

Check "valcambi combibar". Its a gold plate pre-divided into 1g pieces you can break away (like a chocolate bar).

1g is ~100 of money today, which would be enough for a weekly supply of groceries for a person in HCOL areas.

[anonym29]

Additionally, one need not use gold; silver is easier to subdivide into manageable units for even smaller monetary values.