Is the LEGO 7 Named Beams (426-1) rare?

Yes, this set is from 1966 and is listed under the Supplemental theme, indicating its collectible nature.

What is the piece count for this set?

This set, 426-1, has 0 pieces listed.

The LEGO 7 Named Beams (426-1) belongs to the Supplemental theme.

Name: LEGO 7 Named Beams (The Building Toy) (426-1)
Brand: LEGO

Supplemental

Supplemental · 1966

Theme · SupplementalPieces · 0Set Number · 426-1Year · 1966

Used

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New / Sealed

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Is the LEGO 7 Named Beams (426-1) rare?: Yes, this set is from 1966 and is listed under the Supplemental theme, indicating its collectible nature.
What is the piece count for this set?: This set, 426-1, has 0 pieces listed.
What theme does the LEGO 7 Named Beams belong to?: The LEGO 7 Named Beams (426-1) belongs to the Supplemental theme.