The Arabian Merchant Hired Sword allows you to purchase;
Stiletto Blade (need 'Weapons Training' to use +1) +1 Attack per turn at -1 Strength
It's one of the Black Market options, which would be a Cathayan Longsword instead in BTB campaigns with a Cathayan Merchant.
I can't seem to find a cost listed anywhere for this weapon anywhere, any ideas folks?
Cheers,
Werekin.