I believe the notched ones are the newer ones, since I've only seen these recently.
They are probably better in protecting the pin, disc or coin. The older style had a rubber O ring that the item sat in.
I noticed this when I busted out a '63 Salada Mantle several years ago.
Because of this O ring the piece is locked into place so if its not encapsulated centered, you cannot tap it around.
Like you can with the card paper discs.
All my P2 pins, & Topps/Salada/Armour/Old London coins are the non notched style, so I would like to see a close up of the notched style in hand.
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