Wait what's the 1872 pin?? Never heard of that one.
I do love the young alum pin (begged the parents to donate to the foundation to get it

)
Plus the 10 year pin is subtle, I like the fact that the number is roman versus the blatant 25 number. And assuming I live long and prosper for the next two, I like how they are part of the badge (course at that age, I may need help making sure everything is straight

)
Anyways, I've got the diamond and pearl badge, which I got for my 21st birthday and that's the one I love the most!