Is the LEGO 457-1 window piece rare?

Yes, this piece is from the 1966 Supplemental theme, indicating its vintage rarity.

What is the piece used for?

It is a 1 x 1 x 2 window piece, available in either Red or White.

The set, 457-1, contains a total of 19 pieces.

Name: LEGO 1 x 1 x 2 Window, Red or White (457-1)
Brand: LEGO

Supplemental

Supplemental · 1966

Theme · SupplementalPieces · 19Set Number · 457-1Year · 1966

Used

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New / Sealed

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Is the LEGO 457-1 window piece rare?: Yes, this piece is from the 1966 Supplemental theme, indicating its vintage rarity.
What is the piece used for?: It is a 1 x 1 x 2 window piece, available in either Red or White.
How many pieces are in this set?: The set, 457-1, contains a total of 19 pieces.