There are three known mold versions of this part:
3626a Minifig Head ... [Solid Stud]
This seems to be the original version, introduced in 1975. The top stud is solid.
3626b Minifig Head ... [Blocked Open Stud]
This seems to be a later version, introduced in 1978. The top stud is open, and blocked.
3626c Minifig Head ... [Hollow Stud]
This seems to be modern version, introduced in 2011. The top stud is hollow.
The mold comparison image shows all three versions.
Click on a colored part below to see the Sets and MOCs that use part 3626b Minifig Head Plain [Blocked Open Stud] 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.
There are 4 Mold variations of part 3626b - Minifig Head Plain [Blocked Open Stud] in the database, in use between 1990 to 2019. See Molds and other related Parts.
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