The Little Record With The Big (Or Small) Hole

I found this sleeve for a 7" record the other day, and thought it was sorta interesting. For years I thought all 7" 45 rpm records had a big hole in the center. Then I found some with a little hole, but they all played at 33 rpm. Then I found a few records from the UK that had a center you could pop out if you wanted a big hole, or leave the center in for a small hole. I never knew such a think had ever existed here in the US, but here's a bit of proof. The little doodles to the left and right of the center hole explain how to adapt the record to your turntables requirements. You never know what's out there until you find it. 'O.C. 45' they call it, Optional Center, from your friends at Capitol Records.