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There is a Legacy version here.

ShadowItem 5+

Magical Shadow 
Source GM Core pg. 227
Usage etched onto light or medium armor; Bulk
Armor etched with this rune takes on a hazy black appearance. You gain a +1 item bonus to Stealth checks while wearing the armor.

PFS StandardShadowItem 5

Source GM Core pg. 227
Price 55 gp

PFS StandardShadow (Greater)Item 9

Source GM Core pg. 227
Price 650 gp
The item bonus is +2.

PFS StandardShadow (Major)Item 17

Source GM Core pg. 227
Price 14,000 gp
The item bonus is +3.