Napoleon III Coin? How Do I Know If It Is Sm Or Lg Head ?

with the above.

This coin has the BB mintmark which means it was minted at Strasbourg. It has a mintage figure of 4,582,018. My 2018 French coin catalogue values it at 10 euros in TB (VG to Fine) condition.

This series of coins was minted 1852-57, then another design with a laureated Napoleon was minted 1861-65. Too bad your coin wasn't an 1855 BB (with those mint marks, as I first thought), then it would have been worth 10 times as much .

For some reason the coins under Napoleon III used words for the denomination of the 1, 2, 5 and 10 centimes bronzes and numbers for the 20 centimes and upwards silvers.