These are some approximation statistics I've come up for certain oriental blades in my game...
Format:
Size
Name * Cost * Weight * AC * Hardness * HP * Break DC
Damage * Threat/Critical * Range Increment
^^^Special feature and special use descriptions.
Small
Wakizashi * 25 gp * 3 lbs. * AC 6 * Hardness 7 * HP 2 * Break DC 14
2d3 (Slashing) or 1d4 (Piercing) * T/C 18-20/x2 (19-20/x2) * --------
^^^Each time the wakizashi strikes an enemy with total armor, shield, and natural armor bonuses of +5 or greater, or if it misses an enemy because of armor, shield, and natural armor AC bonuses that are due to force effects, metal shields, or armor made with more metal than scalemail, reduce the wakizashi's Hardness by 1.
^^^Likewise, reduce wakizashi Hardness by 1 if striking an object, unless the object has Hardness 5 or less, or unless the strike is to parry a weapon or projectile no more than one size category larger than the wakizashi. If the Hardness is reduced to zero, further reductions are applied to hit points instead, until repaired. These reductions in wakizashi Hardness and hit points last until it is repaired.
^^^The wakizashi deals half damage, rounded up, against opponents with total armor, shield, and natural armor bonuses of +5 or greater. A wakizashi can be used as a martial melee weapon if held two-handed by a character of small or medium size, or one-handed by a larger character.
^^^If masterwork, wakizashi grant a +1 attack bonus as usual, plus, if wielded proficiently, a circumstance bonus of +1 on threat confirmation rolls, retained even if magically enhanced.
Medium
Katana * 50 gp * 6 lbs. * AC 5 * Hardness 7 * HP 3 * Break DC 14
2d4 (Slashing) or 1d4 (Piercing) * T/C 18-20/x3 (19-20/x2) * --------
^^^Each time the katana strikes an enemy with total armor, shield, and natural armor bonuses of +5 or greater, or if it misses an enemy because of armor, shield, and natural armor AC bonuses that are due to force effects, metal shields, or armor made with more metal than scalemail, reduce the katana's Hardness by 1. Likewise, reduce katana Hardness by 1 if striking an object, unless the object has Hardness 5 or less, or unless the strike is to parry a weapon or projectile no more than one size category larger than the katana. If the Hardness is reduced to zero, further reductions are applied to hit points instead, until repaired. These reductions in katana Hardness and hit points last until it is repaired.
^^^The katana deals half damage, rounded up, against opponents with total armor, shield, and natural armor bonuses of +5 or greater. A katana can be used as a martial melee weapon if held two-handed by a character of medium size, or one-handed by a larger character. To wield the katana in one hand requires Strength of at least 13, and this is a prerequisite for gaining any one-handed katana proficiency. A small character requires the appropriate Exotic Weapon Proficiency in order to wield a katana two-handed.
^^^If masterwork, katana grant a +1 attack bonus as usual, plus, if wielded proficiently, a circumstance bonus of +2 on threat confirmation rolls, retained even if magically enhanced.
Large
No-Dachi (Nodatchi) * 65 gp * 20 lbs. * AC 4 * Hardness 10 * HP 10 * Break DC 17
3d4 (Slashing) or 1d6 (Piercing) * T/C 17-20/x2 (19-20/x2) * --------
^^^Each time the no-dachi strikes an enemy with total armor, shield, and natural armor bonuses of +5 or greater, or if it misses an enemy because of armor, shield, and natural armor AC bonuses that are due to force effects, metal shields, or armor made with more metal than scalemail, reduce the no-dachi's Hardness by 1. Likewise, reduce no-dachi Hardness by 1 if striking an object, unless the object has Hardness 7 or less, or unless the strike is to parry a weapon or projectile no larger than the no-dachi. If the Hardness is reduced to zero, further reductions are applied to hit points instead, until repaired. These reductions in no-dachi Hardness and hit points last until it is repaired.
^^^The no-dachi deals half damage, rounded up, against opponents with total armor, shield, and natural armor bonuses of +5 or greater. A no-dachi can be used as a martial melee weapon if held two-handed by a character of large size, or one-handed by a larger character. To wield the no-dachi two-handed requires Strength of at least 15, and this is a prerequisite for gaining any two-handed no-dachi proficiency, while a Strength of 19 is required if the no-dachi is to be wielded one-handed, and likewise any one-handed no-dachi proficiency has a Strength prerequisite of 19+.
^^^The no-dachi's great size incurs a -2 circumstance penalty on all attack rolls with it unless the user is at least large-sized, regardless of proficiency, and this stacks with any nonproficiency penalties if wielded nonproficiently. Likewise, unless the user is at least large-sized or at least has Strength of 19+, they cannot perform a full-attack action with the no-dachi and cannot threaten an area with it.
^^^A no-dachi has reach, and can be used to strike an opponent up to 10 feet away. However, the no-dachi deals only 1d6 slashing damage to opponents within 5 feet, cannot be used for piercing damage against opponents within 5 feet, incurs a -2 attack penalty against opponents within 5 feet, and has its threat range reduced by half against opponents within 5 feet. Any proficient character wielding the no-dachi may use it to perform a Whirlwind Attack, as per the feat, but without need for that feat, and striking all opponents beyond 5 feet who are within the no-dachi's reach.
^^^If masterwork, no-dachi grant a +1 attack bonus as usual, plus, if wielded proficiently, a circumstance bonus of +1 on threat confirmation rolls, retained even if magically enhanced.
Large
Zanmato * 90 gp * 30 lbs. * AC 4 * Hardness 10 * HP 13 * Break DC 20
4d4 (Slashing) or 1d8 (Piercing) * T/C 20/x3 (19-20/x2) * --------
^^^A zanmato can be used as a martial melee weapon if held two-handed by a character of large size, or one-handed by a larger character. To wield the zanmato two-handed requires Strength of at least 15, and this is a prerequisite for gaining any two-handed zanmato proficiency, while a Strength of 19 is required if the zanmato is to be wielded one-handed, and likewise any one-handed zanmato proficiency has a Strength prerequisite of 19+.
^^^The zanmato's great size incurs a -3 circumstance penalty on all attack rolls with it unless the user is at least large-sized, regardless of proficiency, and this stacks with any nonproficiency penalties if wielded nonproficiently. Likewise, unless the user is at least large-sized or at least has Strength of 19+, they cannot perform a full-attack action with the zanmato and cannot threaten an area with it.
^^^A zanmato has reach, and can be used to strike an opponent up to 10 feet away. However, the zanmato deals only 1d6 slashing damage to opponents within 5 feet, cannot be used for piercing damage against opponents within 5 feet, incurs a -3 attack penalty against opponents within 5 feet, and has its threat range reduced by half against opponents within 5 feet. Any proficient character wielding the zanmato may use it to perform a Whirlwind Attack, as per the feat, but without need for that feat, and striking all opponents beyond 5 feet who are within the no-dachi's reach.
How close do you think these approximations are?