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There are only 15-16 complete sets...
...in existence. However, there are several one-offs. My friend Ulrich has some, a few of which he has repaired. Working on these models is beyond difficult, but he can set them right!
Yes, these models are fascinating! I have seen several collections of these, e.g. in Deutsches Technikmuseum in Berlin and in the International Maritime Museum in Hamburg.
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