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There is a Legacy version here.

PFS StandardRune of Observation [one-action] Focus 4

Uncommon Concentrate Focus Wizard 
Source Player Core pg. 387 2.0
Duration 1 hour
You inscribe an invisible eye-shaped rune in the air, creating a sensor as clairvoyance. When created, this eye must be in your line of sight.

Each time the spell's duration ends, you can spend 1 Focus Point as a free action to extend the duration for another hour, though as normal, it ends immediately during your next daily preparations.