Is this LEGO piece rare?

Yes, this 1x2x2 Window (700.B.3-1) is listed under the Supplemental theme from 1950, indicating its rarity.

What is the set number for this window?

The set number for this specific piece is 700.B.3-1.

This listing contains exactly 1 piece.

Name: LEGO Single 1 x 2 x 2 Window without Glass (ABB) (700.B.3-1)
Brand: LEGO

Supplemental

Supplemental · 1950

Theme · SupplementalPieces · 1Set Number · 700.B.3-1Year · 1950

Used

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New / Sealed

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Is this LEGO piece rare?: Yes, this 1x2x2 Window (700.B.3-1) is listed under the Supplemental theme from 1950, indicating its rarity.
What is the set number for this window?: The set number for this specific piece is 700.B.3-1.
How many pieces are included in this listing?: This listing contains exactly 1 piece.