As far as I know there is no modern version around (here), so it couldnt have been put in acid for 20 years. I think there is enough pictures already to show that its indeed an old piece. (No need also to put something in acid for 20 years if nobody knows what it is right?)
But if you know a modern version then please share it with us, I'm seriously intrested. In case you know examples that have been around for century's, then please indicate where (with link if posible).
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