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There is a Legacy version here.

Orichalcum ArmorItem 20+

Rare 
Source GM Core pg. 228 2.0
Usage worn armor; Bulk — varies by armor
Orichalcum armor can be etched with four magic property runes instead of three due to the magical empowerment of orichalcum. If you’re wearing armor made of orichalcum, the armor grants you insights into the future, granting you a +1 circumstance bonus to initiative rolls.

Base Material

Orichalcum

PFS StandardOrichalcum Armor (High-Grade)Item 20

Source GM Core pg. 228 2.0
Price 55,000 gp (+5,500 gp per Bulk)
The initial raw materials must include orichalcum worth at least 27,500 gp + 2,750 gp per Bulk.