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.
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.
Earlier alternate versions had no buttom tubes and were slotted (bslot01 and bslot01a: 1953-1955).
Basic Brick Quicklinks:
Click on a colored part below to see the Sets and MOCs that use part 3004 Brick 1 x 2 in that color. You can find an overview of all LEGO Colors here.
If a color is missing, it probably needs to be added to a Set Inventory.
This part has been used by MOCs in the following colors but not officially released.
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