The conversion of the value of a $75 Amazon card to Nigerian Naira depends on the current exchange rate. Exchange rates are constantly fluctuating in the global currency market.

To determine the exact amount in Naira, it is necessary to check with a reliable financial institution, such as a bank or a currency exchange service as the rate they provide will better reflect the real-time situation. They rely on various economic factors to set the exchange rate for the US dollar to the Nigerian Naira.
Typically, due to factors like inflation and economic policies, the exchange rate can vary significantly over time. So, without knowing the specific exchange rate at a given moment, it's impossible to give an exact figure for how much a $75 Amazon card would be in Naira. One would need to stay updated on the latest exchange rate information to accurately calculate this conversion.