This perfin was used on a cover in 1985 by the Polish Scout Association in Great Britain to honor the 75th Anniversary of the Polish Boy Scout Association.
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The stamp is the one penny definitive perfined in two lines. The top line is just a Z and the bottom the letters H P. These initials are for the Polish Scout Association (Zwaizku Harcerstwa Polskiego).
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No canceled copy of this stamp has yet been seen, as these covers appear to have been a souvenir.