Is the LEGO 451-1 window piece rare?

Yes, this piece is from the 1966 Supplemental theme and is considered a collectible item.

How many pieces are in this set?

The item, LEGO 451-1, consists of 6 pieces.

This specific piece is part of the Supplemental theme.

Name: LEGO 1 x 6 x 3 Window, Red or White (451-1)
Brand: LEGO

Supplemental

Supplemental · 1966

Theme · SupplementalPieces · 6Set Number · 451-1Year · 1966

Used

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New / Sealed

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Is the LEGO 451-1 window piece rare?: Yes, this piece is from the 1966 Supplemental theme and is considered a collectible item.
How many pieces are in this set?: The item, LEGO 451-1, consists of 6 pieces.
What theme does this window belong to?: This specific piece is part of the Supplemental theme.