The crib with the first series
The crib
The set
Variant of Mary
Variant of Jesus
We shall notice a difference between certain parts and the display of the series by the brand. However the variants are always matter for debate. In the 50s in 90, the machines of plastic injection were not as well modern as today and the manual side was more present. It happened enough frequently that differences of positions, sizes and more still color are visible.
If a "variant" is not planned by the editor, it becomes then a manufacturing defect.
If a sword, a flag etc. is absent at the release of the machine due to the lack of material, the collectors will see a defect there.
Of course he maybe collecting them, but being planned in the collection, she cannot make party and even less have a value...