The thing is with this type of patch is that we associate the cutoff marks with the cutoff of color.
The cut off marks are not always associated with the cut off---of the colors.
You have to look deep into the lines of the glass to really get the cutoff marks sometimes.
I could call this one an Akro "Hero type" based on what I looked at under heavy personal investigation via my image software. It may well be a Master---just my humble opinion.
All opinions’ are appreciated and welcomed.
Marble--On!!