Nevertheless, the refinery remained busy as staff turned their skills to making fine gold bullion bars.

Exhibits include banknotes, coins, documents, photographs, maps, silver and gold bullion bars, bullion coins, dies and moulds.

In the European Union, the minimum purity for gold bullion, which is treated as investment gold with regards to taxation, is 99.5% for gold bullion bars and 90% for bullion coins.

Although the tola has been officially replaced by metric units since 1956, it is still in current use, and is a popular denomination for gold bullion bars in Bangladesh, India, Nepal, Pakistan and Singapore, with a ten tola bar being the most commonly traded.