Allegra concentrates on summoning up the appropriate state of mind. Come on, she's done this while injured a lot worse than just having a headache.
"This is the long incantation form, it'll take about thirty seconds, it saves mana doing it this way in case we want to experiment some more.
Aesh." She traces a rune in the air, a point, then a small peak, then a long downwards slash. "Aesh. Rune of Thought. Rune of the Staff. Aesh to open the way... Aesh."
She repeats this, then, "Ophis." A similar rune, but this one continues with a second small downwards peak and an upwards stroke. "Ophis the bright lantern. Ophis the rune of revelation. Ophis."
And she traces the outline of Ophis over the stamper on her belt.
The spell goes off. It is not much like a Golarion spell at all; there is no complex geometry to it, just traces, flows of power that come from a place inside Allegra - connected to her, but not in any particular physical location - and wrap themselves around the stamper, searching, questing, almost alive. They marshal themselves together and flow back into her, reporting the information back about the object.