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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A handy part you may need! Here is the Campy concave washer from the vintage days that fits on the forward part of a braze-on front derailleur braze-on. This piece sits under the bolt/washer you use to tighten the derailleur into place. We do not have the bolt/washer, but worst case you should be able to improvise to find workable substitutes. But you can't easily improvise if you are missing this piece. We found a bunch of them so we can offer them for a very nice price. And if the one on your bike is crusty and rusty, than this lovely NOS fresh one is a nice upgrade.