Massalia bronze?

[redwine]

O: Helmeted soldier right
R: Cavalier right
Bronze
3.5g
15mm

I've got four bronze pieces like this with not so distinct but definitely different reverses.
I was looking at Greek Massalia but have got nowhere.  Any thoughts please. 
Many thanks.

[redwine]

Sorted! 
Wrong coast!   

NAMNÈTES (Region of Nantes)

Missing from La Tour.

The only Namnetes piece in the whole of the excellent CGB archive! 

See http://www.cgb.fr/namnetes-region-de-nantes-bronze-au-cavalier,bga_277822,a.html

And I've checked all four and now I know what I'm looking for, it would appear they're all horsemen 
This is the earliest coin I've seen with a top hat featured  Circa C1 BC.