"Potential" meaning obvious. I have seen more than five of the following...

MONKEY KING BAR and BLACK KING BAR (x/x/x/x/45), (x/x/x/x/50), (x/x/x/x/55), (x/x/x/x/60)
Charge Vulcan (x/x/x/x/70)
Charge Vulcan (x/x/x/x/75) (lucky me...)
Charge Vulcan (x/x/x/x/65)
YAMIGARISU (x/x/x/x/50)
HEAVEN STRIKER (x/x/x/x/50), (x/x/x/x/55)
Charge Calibur / DARK FLOW (x/x/x/x/80)
RED SWORD (x/x/x/x/50)
SLICER OF FANATIC (x/x/x/x/50)
DARK FLOW (x/x/x/x/70)
OROTIAGITO (x/x/x/x/50)
ZANBA (x/x/x/x/40), (x/x/x/x/50)

Anyone seen anything else floating around lately?

On another note. Taking these from people seems like it could be really hard sometimes. Would it be acceptable to ban people with lots of these dupes for account cleanings later?

i saw those weapons 2 times, but i wasn't sure if confiscate them.

watching now the epidemy over this, banning to the people means drop masive bans, sadly confiscateing them will not clean up their accounts.

probably a ban will be better than ask for the item voluntarily.

once this is list can be confirmed as dupes, i'll add them to the dupes list later.

These... especially the Charge Vulcans, Caliburs and Orotiagitos.
I have been seeing many many of these since before the month of down time even... I would estimate since back around the time of the Golden Torr event.
Also Spread Needles with 50-60% or more Hit, these started showing up when the RedSwords with 50-60% or more Hit did. back during the Alabasta investigations.

possibly people feel more safe about distributing these wares since its been awhile, or maybe back to exploiting whatever they found to hack/dupe these items?

you can always ban ppl asking an account check, you already knows the process, if nothing is found, the acc is given back or if only needs item removal.

actually i blame to the chinese ppl about the potential dupes we are having, they did the items and others just uses exploits..