How rare is the LEGO Technic Sp3-1 from 1977?

As a single-piece item from 1977, the Sp3-1 is considered a rare find for Technic enthusiasts.

Is this battery box still functional?

The listing only specifies the piece count and year, so functional status is not detailed in these facts.

This specific piece, Sp3-1, belongs to the Technic theme.

Name: LEGO 4.5V Motor Battery Box (Sp3-1)
Brand: LEGO

Technic

Technic · 1977

Theme · TechnicPieces · 1Set Number · Sp3-1Year · 1977

Used

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New / Sealed

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How rare is the LEGO Technic Sp3-1 from 1977?: As a single-piece item from 1977, the Sp3-1 is considered a rare find for Technic enthusiasts.
Is this battery box still functional?: The listing only specifies the piece count and year, so functional status is not detailed in these facts.
What theme does this LEGO piece belong to?: This specific piece, Sp3-1, belongs to the Technic theme.