How rare is the LEGO Red Box (785-1)?

This set is from the 1973 Supplemental theme and is noted as having only 1 piece, indicating high rarity.

What is the theme of set 785-1?

The theme for this specific set number is Supplemental.

The listing specifies that this set contains only 1 piece.

Name: LEGO Red Box (785-1)
Brand: LEGO

Supplemental

Supplemental · 1973

Theme · SupplementalPieces · 1Set Number · 785-1Year · 1973

Used

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New / Sealed

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How rare is the LEGO Red Box (785-1)?: This set is from the 1973 Supplemental theme and is noted as having only 1 piece, indicating high rarity.
What is the theme of set 785-1?: The theme for this specific set number is Supplemental.
Is this a complete set?: The listing specifies that this set contains only 1 piece.