Are 2006 dollars exchanged in Mui Ne and Phan Thiet?

Yes, you can, there are no problems exchanging old-currency dollars in Phan Thiet and Mui Ne, and in Vietnam in general. However, the exchange rate may be slightly lower by 100-500 dong per dollar compared to new dollars, this difference depends on the specific exchange location and you can even bargain about it. So if you have a choice, to buy new dollars in Russia more expensive by a few rubles or old ones cheaper, you can safely buy old ones, it will even be more profitable. We calculated everything, and it turns out that if you buy new dollars in Russia more expensive than old ones by more than 1.5 rubles, then it makes no sense, it will be less profitable than old ones. For more details. What you need to know about currency and money in Vietnam and which currency to bring, read in our updated guide here - https://nashaplaneta.net/asia/vietnam/money

How much does a visa to Vietnam cost?
Where to go in Vietnam for the first time?
Where is best to buy tours to Vietnam?
Follow the link, all these questions are discussed in the chat - https://t.me/vietnam_travel_chat