Is this LEGO set rare?

Yes, this is a vintage 1980 Supplemental set (841-1) with only 2 pieces, contributing to its rarity.

What year was this baseplate released?

The LEGO Baseplates, Green and Yellow (841-1) were released in 1980.

This Supplemental set, number 841-1, contains only 2 pieces.

Name: LEGO Baseplates, Green and Yellow (841-1)
Brand: LEGO

Supplemental

Supplemental · 1980

Theme · SupplementalPieces · 2Set Number · 841-1Year · 1980

Used

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New / Sealed

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Is this LEGO set rare?: Yes, this is a vintage 1980 Supplemental set (841-1) with only 2 pieces, contributing to its rarity.
What year was this baseplate released?: The LEGO Baseplates, Green and Yellow (841-1) were released in 1980.
How many pieces are in this set?: This Supplemental set, number 841-1, contains only 2 pieces.