The triangle Character Stampers were first released as a Happy Meal™ Promotion in 1992.

The Grimace™ stamper appeared in Grimace's™ Galaxy Birthday Party pack in 1994.
The Ronald™ stamper appeared in Ronald's™ Magic Birthday Party pack in 1994.

Other Character Stampers from 1994 Party Packs may exist.

(Ronald photographs courtesy Dave Edwards)

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