Without checking my references, I'm thinking these first popped up with 1960 Hockey in Canada. I believe Topps didn't start selling cards until New Years in 1960 (59-60 set). Going on memory though.
Woody Gelman's Card Collectors Co. sold these (or something like these) for a bit in the mid to late 60's. They had some with and some without the slits. Likely overstock if so.
Last edited by toppcat; 11-14-2020 at 10:03 PM.
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