How does the Sub Weapon Exchange Coupon work?

Can you use a sub weapon exchange coupon on a black horn warrior bow on a wizard? If so what sub weapon would it get?

 

I believe the coupon only works on boss gear ie. kzarka,dande,nouver/kutum. You take a kutum black horn bow and if you are on a class the weapon doesn’t belong to you use the voucher, it will swap it to your classes’ sub weapon. (If you use on wizard you will get a dagger.) I think it also recoverers the weapons max durability so make sure you enhance it as much as possible before you swap it.