Need help
(again i know) 
http://www.ebay.de/itm/Tiffany-Co-S...Uhren_Schmuck_Echtschmuck&hash=item35cac7dee1


http://www.ebay.de/itm/Tiffany-Co-S...Uhren_Schmuck_Echtschmuck&hash=item35cac7dee1
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Looks fine, no red flags. Possibilities for the "cut" in the links are repair jobs (lengthening etc..) or a wearing of the solder which happens sometimes in second hand necklaces when the links rub.