It is the buyers responsibility to examine all items to determine if an item is safe for use The buyer accepts all responsibility for use of items purchased
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Vincenza - we have a problem! Offered here is a pat 82 Super Record rear derailleur. The cage rotation assembly is not rotating right - it's very stiff. And looking at the outside, we wonder if there are some incorrect or missing parts here? The body actually isn't too terrible looking. But the pulleys are Suntour and running rough. So this is not a mechanically happy unit. Scraps on the pivot bolts too - (of course there are!).
If you have more time than we do, this could have some potential but you're on your own - you get what you see and we don't want to accept a return on this..