How rare is the LEGO 214.9-1 set?

This set is from 1961 and belongs to the Supplemental theme, making it a vintage collectible item.

What is the piece count for this LEGO set?

The LEGO 214.9-1 set contains a total of 20 pieces.

The 1x1x1 Window Frame is part of the Supplemental theme set.

Name: LEGO 1 x 1 x 1 Window Frame (214.9-1)
Brand: LEGO

Supplemental

Supplemental · 1961

Theme · SupplementalPieces · 20Set Number · 214.9-1Year · 1961

Used

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New / Sealed

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How rare is the LEGO 214.9-1 set?: This set is from 1961 and belongs to the Supplemental theme, making it a vintage collectible item.
What is the piece count for this LEGO set?: The LEGO 214.9-1 set contains a total of 20 pieces.
What theme does the 1x1x1 Window Frame belong to?: The 1x1x1 Window Frame is part of the Supplemental theme set.