Doesn't look like a Tiffany stamp to me. Never seen 326 either. Tiffany markings are always crisp and precise, with a dot after the Co. Sorry, it doesn't look like a T Co piece to me at all, but I could be wrong.
I have my doubts too...that's why I posted for second opinions....it just looks different than the others on eBay....much smaller in design (thinner chain and star). I really wanted this bracelet (as I have the matching necklace) and was previously outbid (on an authentic piece) by that damn reseller Madison880 who is now reselling for double the bid price lol. I will wait for Sadie to respond as she is familiar with vintage pieces....thank you!