"Sometimes things that are not true are included in Wikipedia. While at first glance that may appear like a very great problem for Wikipedia, in reality is it not. In fact, it's a good thing." - Wikipedia.
Aha! So maybe Milovice sold it to Piestany? A long time ago I asked Milovice if they had any information on it, but they didn't reply. Maybe see if Piestany can be more helpful? I have seen a claim that it's a Czech 1970s film prop, but nothing concrete.
Thanks.
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"Sometimes things that are not true are included in Wikipedia. While at first glance that may appear like a very great problem for Wikipedia, in reality is it not. In fact, it's a good thing." - Wikipedia.