Is the LEGO 423-3 set rare for collectors?

Yes, this set is from 1966 and is categorized under the Supplemental theme, indicating it is a vintage collectible.

How many pieces are in the LEGO Curved and Round Bricks set?

The set number 423-3 contains a total of 28 pieces.

This particular set is listed under the Supplemental theme.

Name: LEGO Curved and Round Bricks (The Building Toy) (423-3)
Brand: LEGO

Supplemental

Supplemental · 1966

Theme · SupplementalPieces · 28Set Number · 423-3Year · 1966

Used

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New / Sealed

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Is the LEGO 423-3 set rare for collectors?: Yes, this set is from 1966 and is categorized under the Supplemental theme, indicating it is a vintage collectible.
How many pieces are in the LEGO Curved and Round Bricks set?: The set number 423-3 contains a total of 28 pieces.
What theme does the 1966 LEGO set 423-3 belong to?: This particular set is listed under the Supplemental theme.