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There is a Legacy version here.

Weapon PotencyItem 2+

Magical 
Source GM Core pg. 236
Usage etched onto a weapon; Bulk
Magical enhancements make this weapon strike true. Attack rolls with this weapon gain a +1 item bonus, and the weapon can be etched with one property rune.
You can upgrade the weapon potency rune already etched on a weapon to a stronger version, increasing the values of the existing rune to those of the new rune. You must have the formula of the stronger rune to do so, and the Price of the upgrade is the difference between the two runes' prices.

PFS StandardWeapon Potency (+1)Item 2

Source GM Core pg. 236
Price 35 gp
Craft Requirements You are an expert in Crafting.

PFS StandardWeapon Potency (+2)Item 10

Source GM Core pg. 236
Price 935 gp
The item bonus to attack rolls is +2, and the weapon can be etched with two property runes.
Craft Requirements You are a master in Crafting.

PFS StandardWeapon Potency (+3)Item 16

Source GM Core pg. 236
Price 8,935 gp
The item bonus to attack rolls is +3, and the weapon can be etched with three property runes.
Craft Requirements You are legendary in Crafting.