As Alan has said, this is a 100% Murano weight.
And as glasstrufflehunter has said, it is probably Fratelli Toso.
Fratelli Toso are well known for using "very coggy" canes (but probably not the only company to use them) and also for aventurine or "coloured chip" grounds.
Some people may have been thrown off a little by Peter's initial photos, which are compressed vertically and show the weight as an oval shape rather the the circular / rounded form it actually is.