It looks like this Part has been superseded by LEGO Part 15254 Brick Arch 1 x 6 x 2 - Thin Top without Reinforced Underside [New Version].




There are 1 more photos of this Part
Replaced 3307 from approximately 2011 when all arches were slowly tweaked to prevent out of system or weak connections, and to allow nesting with some of the new curves. Replaced by 15254 with the introduction of the spoked arch piece 20309.

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There are 3 Mold variations of part 12939 - Brick Arch 1 x 6 x 2 - Very Thin Top without Reinforced Underside in the database, in use between 2013 to 2016. See Molds and other related Parts.

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