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There is a Legacy version here.

Armor PotencyItem 5+

Magical 
Source GM Core pg. 226
Usage etched onto armor; Bulk
Magic wards deflect attacks. Increase the armor's item bonus to AC by 1. The armor can be etched with one property rune.

You can upgrade the armor potency rune already etched on a suit of armor using the normal process for upgrading items and runes.

PFS StandardArmor Potency (+1)Item 5

Source GM Core pg. 226
Price 160 gp
Craft Requirements You're an expert in Crafting.

PFS StandardArmor Potency (+2)Item 11

Source GM Core pg. 226
Price 1,060 gp
Increase the armor's item bonus to AC by 2, and the armor can be etched with two property runes.
Craft Requirements You're a master in Crafting.

PFS StandardArmor Potency (+3)Item 18

Source GM Core pg. 226
Price 20,560 gp
Increase the armor's item bonus to AC by 3, and the armor can be etched with three property runes.
Craft Requirements You're legendary in Crafting.