Locking Cube - a classic puzzle

Look out for this one! First you have to figure out how to get it apart. Its not obvious at all. Then when you get it apart the fun has just begun. Tough to get back together even though its only 6 pieces. the required assembly is sequential, the pieces must be assembled in exactly the correct way in the correct order. About 2.75" cube.

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Locking Cube - a classic puzzle

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