The mint signature is certainly CANTO at the top of the rev. picture because there is no sign of a termination. Where it would be is flat, and it doesn't matter whether it is a colon or initial cross, it ain't visible.
RAVL is a distinct possibility given the width of the A. I'll bear that in mind. If the curl inside the C is an R tail, we are halfway there. The following A would be super-imposed on the A of the moneyer name, so possible slightly different profile given the possibility of made up letters from lines, crescents and wedges.
The mint signature looks to cover about 150 degrees of the legend