Is the LEGO Brick Wallet Blue (851904-1) rare?

As a 2007 item from the Gear theme, this set number (851904-1) is a specific collectible piece.

What theme does the LEGO Brick Wallet Blue belong to?

This item is part of the Gear theme.

This specific set, 851904-1, contains 0 pieces.

Name: LEGO Brick Wallet Blue (851904-1)
Brand: LEGO

Gear

Gear · 2007

Theme · GearPieces · 0Set Number · 851904-1Year · 2007

Used

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New / Sealed

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Live on eBay now

Converted from USD at the ECB reference rate — sold comps are US-market sales.

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Is the LEGO Brick Wallet Blue (851904-1) rare?: As a 2007 item from the Gear theme, this set number (851904-1) is a specific collectible piece.
What theme does the LEGO Brick Wallet Blue belong to?: This item is part of the Gear theme.
How many pieces are included in set 851904-1?: This specific set, 851904-1, contains 0 pieces.