Thanks Trev,
That's close but not quite close enough, I think, to tie this down. The lozenge below the central strawberry leaf should be diamond in shape. I'd also seen the French Marquis coronet, as below, which has the correct headband (if that's the right term), but has pearls on the points. What's needed is something which merges the two (maybe that's exactly what the engraver did, accidentally!)
There's also a Portugese one, similar to the Spanish version, but again the headband doesn't match since we need alternate diamond and lozenges:
So we have three almost, but not-quite-correct, coronets from the Wiki page, but from three different countries.....