Is this LEGO window piece in good condition?

The listing describes this as a single piece from the 1950 Supplemental set.

What theme does this LEGO window belong to?

This specific piece belongs to the Supplemental theme.

This listing contains exactly 1 piece.

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

Supplemental

Supplemental · 1950

Theme · SupplementalPieces · 1Set Number · 700.B.2-1Year · 1950

Used

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New / Sealed

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Live on eBay now

Converted from USD at the ECB reference rate — sold comps are US-market sales.

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Is this LEGO window piece in good condition?: The listing describes this as a single piece from the 1950 Supplemental set.
What theme does this LEGO window belong to?: This specific piece belongs to the Supplemental theme.
How many pieces are in this listing?: This listing contains exactly 1 piece.