What is the value of 500 customs gold units of 1930?

The value of 500 customs gold units from 1930 can vary significantly based on factors such as the specific country, the historical context, and current gold prices. Generally, customs gold units were used for trade and taxation purposes, and their value would be linked to the gold standard at the time. To estimate a modern equivalent, one would need to convert the gold units into their gold weight and then determine the current market price of gold. For precise valuation, historical records or expert appraisal would be required.