Find the value of X - brainteaser

Each symbol has a value. Can you find the value of X?

Guess the year - brainteaser

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A man decides to celebrate new year by painting a banner of the year number, attaching it to his plane and, on midnight, fly his plane showing his banner to the world.

Just before midnight, he takes off and flies around for a bit. When midnight came, he released the banner. He realises that the banner is upside down!!! Amazingly, it still reads the correct year.

In which year did he paint the banner?