Great pictures, pink pistils are always a beautiful sight to see. In that you grew bagseed it is impossible to say with any certainty if it was due to normal genetics or if you ended up with a different phenotype but I have seen many plants with pink pistils over the years. I have only had them several times over the decades but between the few strains I have had and friends and what I have seen in forums like this it really is not all that rare.
The only strain I can think of off the top of my head that is known for its pink pistils is:
TH Seeds - Stinky Pinky
Location: indoor,
outdoor;
Type: indica;
Flowering: ~60 days; No feminized seeds.
Known Phenotypes:
This is a beautiful, mostly Indica variety
that has pink pistils highlighting some of the plant`s very distinctive budding patterns, It`s rounded main cola with a `crown` of buds and not much more below, make this a Great Sea of Green plant. This plant came to us as a cutting back in 1995. Even as a cutting this plant smells strong, so good ventilation is a must.
Type : Indica
Height : 120 - 140 cm
Yield : 350-400 p.s.m.
Flowering Time : 60 days
Strain Lineage / Genealogy / Family Tree
There are others but that is the only one I am positive about off the top of my head. I want to say that Pink Bazooka and Pink Plant also got their names for the same reason but I cannot swear to it.
If I could find the picture I could post one that would amaze some people. I did not grow the plant myself but it had blue pistils and no dye was used and no photoshopping was done to the picture, they were blue.