yes a very old pattern.. A MM ring will always have at least one or combo of:
- A skull,, a hour glass,, a scythe,, stars,, a half moon,, a sword,, and occasionally a crucifix.,,a swastika regular or reversed ..
Benten,,,what are those marks your showing us? some type hallmarks.....
- And Ric,,,is the content mark on your Pz skull ring behind the skull in a square??
The squares:
I don't know Gaspare. There are very small differences in high; the left inside square is in incuse, deep, the right inside quare is a bit higher, the square on the rear is "highest" . Very small differences. Maybe they are also symbolic, just like the other symbols on the ring.