It should be this one: 1/4 ECU 169(4?)P (Dijon). The weight is ca. 0.5 g. more than yours but your coin is a bit worn, so I guess the weight can match.

The only problem is the LUD XIV. On most coins it's written as LUD XIIII, like you can see here on the similar 1 ECU:

But this picture is from a coin struck in Paris (mintmark A). Your coin is struck in Dijon (mintmark P). There aren't many pictures for these coins in Krause, so maybe the coins struck in Dijon have lettering LUD XIV in stead of lettering LUD XIIII.
Probably collectors with a special interest in French coins have a more specialized catalog with more pictures, so hopefully they can confirm my guess.
The note for the 1 Ecu coin says some of these coins are struck over recalled ECU's. It looks like your coin is also struck over another coin (remaining "fleur de lis" and lettering under the bust).