Rare Chum Radio Survey Error Chart x2 Sept 1966 Vintage Beatles #1 Donovan #2Chum Chart rare error Chart. 2 Charts both dated Sept 5 66. Green Chart is actually Aug 29th, 1966 issue and can be confirmed by looking at Sept 5 66, last week number which matches this week's number on Aug 29 66 Chart Measurements: Both are 7 x 5. 75 open Both charts in excellent condition; little to no notable creasing, no rips or tears Follow us on Instagram and Facebook (glorydayscollectibles) to stay up to date on upcoming auctions and events