Other 60s sets with wood grains:
1969 Topps Brady Bunch
1960 Fleer Casper the Ghost
1966 Topps Football
1966 Topps Hockey
But... my guess is it's either a printer's marking on the side of a sheet or an odd print defect.
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PWCC: The Fish Stinks From the Head
PSA: Regularly Get Cheated
BGS: Can't detect trimming on modern
SGC: Closed auto authentication business
JSA: Approved same T206 Autos before SGC
Oh, what a difference a year makes.
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