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??