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Does a mithral brestplate have a AC of -1 or 0. I am not sure if the masterwork quality still gives it a -1 or if they have already added that into the mithral material.
You mean 'ACP', not 'AC'.
The Armour Check Penalty for a mithral breastplate is -1.
The general masterwork armour quality of reducing ACP by one is already included in the -3 from mithral.
Take the Armour Expert trait to get rid of that pesky remaining 1-point penalty. It works for masterwork chain shirts too. : )

galahad2112 |
ACP of -1. Think of the Mithral component as giving +2 to Max Dex and ACP, and the automatic masterwork further reducing ACP by 1, for the Mithral's description of +2 to max dex and reducing ACP by 3.
There are a couple of ways to reduce the ACP to 0, though. The Armor Expert trait is one way and the Comfort enhancement is another.
But just standard Mithral Breastplate is +6 AC, -1 ACP, +5 max dex, 15% ASF, and 15 lbs. for a cost of 4200 gp.