Is the 1978 LEGO Baseplate (745-1) rare?

Yes, this piece is from 1978 and is listed under the Supplemental theme, indicating it is a collectible item.

How many pieces are in this set?

This item consists of a single piece.

The LEGO Baseplate (745-1) belongs to the Supplemental theme.

Name: LEGO Baseplate, Green (745-1)
Brand: LEGO

Supplemental

Supplemental · 1978

Theme · SupplementalPieces · 1Set Number · 745-1Year · 1978

Used

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New / Sealed

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Is the 1978 LEGO Baseplate (745-1) rare?: Yes, this piece is from 1978 and is listed under the Supplemental theme, indicating it is a collectible item.
How many pieces are in this set?: This item consists of a single piece.
What theme does the Green Baseplate (745-1) belong to?: The LEGO Baseplate (745-1) belongs to the Supplemental theme.