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I was trying to rebuild the LEGO Harry Potter Hogwarts Castle from 2001 and I’ve noticed that at some point they changed the 1x2’s model. Which design is older?

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I remember seeing some new bricks reusing (probably updated) older variation of the mould. So this kind of information isn't always accurate.

Here what Rebrickable tells about variations of Brick 1 x 2:

There are three known mold versions of this part:

3065 Brick 1 x 2 without Bottom Tube This is the original version, introduced in 1955. The inside has no bottom tube. While it was replaced by a tubed version in 1959, it was kept in production for transparent colors.

3004 Brick 1 x 2 with Open Bottom Tube This seems to be the modern version. The bottom tube is open.

3004 Brick 1 x 2 with Solid Bottom Tube This seems to be an older version. The bottom tube is solid.

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And since Rebrickable's idea is to keep accurate inventories for each set they have following disclaimer for this brick:

The mold comparison image shows all three versions. As long as we are unsure when the mold change of 3004 happened, we cannot create different parts for these molds.

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