Is this LEGO piece rare?

Yes, this is a single piece (1) from the 1996 Supplemental theme, suggesting it is a collectible item.

What is the theme of this plate?

The theme associated with this piece is Supplemental.

This LEGO X-Large Building Plate was released in 1996.

Name: LEGO X-Large Building Plate (Light Gray) (628-1)
Brand: LEGO

Supplemental

Supplemental · 1996

Theme · SupplementalPieces · 1Set Number · 628-1Year · 1996

Used

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New / Sealed

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Is this LEGO piece rare?: Yes, this is a single piece (1) from the 1996 Supplemental theme, suggesting it is a collectible item.
What is the theme of this plate?: The theme associated with this piece is Supplemental.
What year was this LEGO plate released?: This LEGO X-Large Building Plate was released in 1996.