The US $100 bill was introduced in 1914 and would have been worth over $3,300 in today's dollars. Even if that's only about half what $10k SGD is worth, that's still a hell of a long time to hold that ceiling

whoa i literally live here and i didn’t even know we had $10,000 notes

And one of the least was currency from Zimbabwe when they were experiencing hyper inflation. I'm technically a 100 trillionaire - and at the time I bought that bill, shipping it cost more than the item.

According to the same article, they are not being produced anymore. They still are legal tender in both countries though. As of 2026, I would say that the most valuable banknote still in active production is the CHF 1.000 banknote; someone please correct me if I'm wrong.