Is the LEGO Brick Separator (821-1) rare?

Yes, this piece is listed as a single item from the 1990 Supplemental theme, suggesting relative rarity.

What is the theme of this piece?

The LEGO Brick Separator (821-1) belongs to the Supplemental theme.

This item consists of only 1 piece.

Name: LEGO Brick Separator, Gray (821-1)
Brand: LEGO

Supplemental

Supplemental · 1990

Theme · SupplementalPieces · 1Set Number · 821-1Year · 1990

Used

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New / Sealed

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Is the LEGO Brick Separator (821-1) rare?: Yes, this piece is listed as a single item from the 1990 Supplemental theme, suggesting relative rarity.
What is the theme of this piece?: The LEGO Brick Separator (821-1) belongs to the Supplemental theme.
How many pieces are in this set?: This item consists of only 1 piece.