From the look of the cards, they are not ESCO products. ESCO used a polished finish tan stock front and back in the relevant period until the late 1960s when they switched to a white stock.
There are a variety of counterfeits out there. One tell-tale sign (besides the stock) is that there are no duds in the lots. The counterfeiters targeted the star players. Also, not all copies were made recently to deceive. Many were made in the 1970s-1980s and will show some age.
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