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When did the Lego bricks and plates start to have little holes in the bottom pins?
I am re-piecing together some of my old eighties castle sets. When ordering light gray and black bricks and plates through BrickLink, I often get bricks and plates that have little holes in the bottom pins. I found out this is an evolution in the molds to spare some plastic. But I can't seem to find information to the time when they start producing these. I never had these 'back then' but it might be possible they already existed in the mid-eighties.
So my question is when they start using these molds?
Any tips and tricks on how to get the right time period for the bricks and plates in BrickLink stores might be helpful as well. There are some sellers who put more detailed information in their lot descriptions, but I presume this is very time consuming. Maybe there is some kind of list of sellers who sort out 'older' and 'newer' bricks.
Thank you for your help on this subject.