The Tekko-kagi (Ultimate Equipment p. 38) can be used defensively like a buckler.
- Does that mean a monk could use it to gain a shield bones while retaining his monk AC bonus, seeing that is not a shield, even though used like one? A mithral Tekko-kagi would have no ACP and thuswould need no shield proficiency.
- Could a Tekko-kagi be enchanted with shield enhancement, like a shield that can also be used as weapon can also be enchanted as weapon?
1. Yes. This is similar to the Two-Weapon Shield feat.
2. No, it's not a shield.
No, it's not. The weapon isn't providing a shield bonus like the feat or a blocking weapon, per the text the weapon is actually used as a buckler.
Price 2 gp
Also known as an iron claw, this device consists of a fanlike structure of three or more 10-inch blades secured to a sturdy handle strapped to the forearm of the off hand. It can be used as an offensive weapon or defensively like a buckler, or used to disarm an opponent without provoking an attack of opportunity. It provides its owner with a +2 circumstance bonus on attempts to disarm or sunder swords or other slender-bladed weapons.