They were given as a gift from a 'posh' friend who I am not friends with any longer. I moved in 2005 after a nasty split and somewhere in the shuffle the bags were lost (among other things!), the boxes I hadn't kept.
The oval tag necklace is slightly curved and every link on the chain is pretty much seamlessly soldered. The clasp is solid and has good movement.
ETA: The links in the necklace are also not completely round, but a *subtle* oval shape.