12 years ago I went to the museum and auction house in Vienna and asked what kind of processing is it?one said souvenir from mexico and the other said 1920 artist, my sister sent it to sothebys and asked about it, sothebys was more serious and said: we don't have any experts.i said to her it doesn't matter, this is a souvenir from 1920, a present from vienna to mexico, she shook her head and left, she didn't understand what i was saying.what's inside shouldn't be