Aaaahhh, I collect them too. They may be found even with a legit aluminum head, that can be tell by the white tarnish and crude finish.
As a rule of thumb, only the Polish cuipagga is fitted with rings along its top spine; post WWII have fewer small diameter rings (usually of brass) while older ones have more rings of larger diameter, made of steel and overlapping each other.
My oldest one is dated 1888 and I have another one (finely made a looks like a custom presentation piece, not a touristic item)dated 1976 which I bought in Bratislava.
The photo is from 1910 hungary.
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