For me, the 59 GBs have less of a glossy (duller) sheen on their front than the WB cards. Easy to identify IMO. With the 60s, besides the small variations on the front, their sheen variance on the front is less noticeable to me, but the WBs appear to be just slightly glossier.
With the 1960s, in addition to the GB and the "dull" WB, there is also a much rarer "bright" WB version.
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