XVIIth / XVIIIth century Italian? Spanish? mark to identify

[luki-g]

Is this mark familiar to anyone?
My gut feeling tells me that it comes from Italy or Spain or even the New World but I may be wrong.
It is much bigger than holly water fountains from Germany, it measures 32.00 x 19.80 x 5.80 cm and weights 361 gramms.
I will be very grateful for help.

[luki-g]

Just to let you know that I had it attributed to Alto Peru.

[luki-g]

apparently there is a literature but I didn't have a chance to get it in my hands:

Silberschätze aus Südamerika, Munich 1981, no. 57 ff.