How rare is the LEGO Lighting Brick (2x2) Sp15-1?

This piece is from the 1977 Service Packs set (Sp15-1) and is considered a rare find for collectors.

What theme does this brick belong to?

This LEGO piece belongs to the Service Packs theme.

This listing includes exactly 1 piece.

Name: LEGO Lighting Brick (2 x 2) (Sp15-1)
Brand: LEGO

Service Packs

Service Packs · 1977

Theme · Service PacksPieces · 1Set Number · Sp15-1Year · 1977

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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How rare is the LEGO Lighting Brick (2x2) Sp15-1?: This piece is from the 1977 Service Packs set (Sp15-1) and is considered a rare find for collectors.
What theme does this brick belong to?: This LEGO piece belongs to the Service Packs theme.
How many pieces are in this lot?: This listing includes exactly 1 piece.