Is the LEGO Storage Case (781-1) rare?

Yes, this piece is from the 1982 Supplemental theme and is listed as a single, rare item.

What is the theme for this LEGO set?

The theme for this specific piece is Supplemental.

This item consists of only 1 piece.

Name: LEGO Storage Case (781-1)
Brand: LEGO

Supplemental

Supplemental · 1982

Theme · SupplementalPieces · 1Set Number · 781-1Year · 1982

Used

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New / Sealed

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Is the LEGO Storage Case (781-1) rare?: Yes, this piece is from the 1982 Supplemental theme and is listed as a single, rare item.
What is the theme for this LEGO set?: The theme for this specific piece is Supplemental.
How many pieces are in the LEGO Storage Case (781-1)?: This item consists of only 1 piece.