Where Is This Coin From And Is It Old

This is usually called a seaman's or fisherman's charm
Obverse:
St. George, mounted, slaying dragon
Around which:
St. GEORGIUS EQUITUM PATRONUS
(St. George Patron Saint of Knights)
Reverse:
A storm tossed ship containing a sleeping Christ
and two frightened Apostles
Around which:
INTEMPESTATE SECURITAS
(Safety in the storm)
You can read all sorts of nonsense about these on ebay. Here's the true story:
The obverse comes from a coin called a Mansfeld thaler. First minted in 1521, it was commissioned by a
Count vonMansfeld
and honoured his family's patron saint. The von Mansfeld family trade was warfare and his symbol was adopted for luck by his mercenary troops.
Skipping forward a century or so and the thaler had been replaced by a charm or amulet bearing St George but now with the addition of Christ on the reverse.
This design is generally credited to a Hungarian engraver, Christian Hermann Roth and, with modifications, has been in continuous production ever since.
Even resources like the British Museum get this one wildly wrong.

That style is usually 50-80 years old.