anyone familiar with French Indo-China double dies?

sadysta1

Here's one, anyone familiar with this variety?
key 1923 cent

Vietcoins

Your 1923 coin had a minting of 27,891,109 coins with the tunderbolt mark. The 1923 coin with an "A" mintmark had only 1,079,468 minted. The double die might bring the value up but these coins are not really sort after except in France.