Per PSA's website, series #1 (card numbers 1 through 180) were printed with both white and gray backs, with cards numbered 1 through 100 containing more white backs, while cards #101-180 containing more gray.
http://www.psacard.com/Articles/Arti...baseball-cards
Since Mantle's 1956 Topps card is # 135, the white back variation is more scarce, and would be the one commanding a premium, if any. However, in looking at recently sold PSA 5 1956 Topps Mantles, I'm not seeing any discernible premium on the cards with white backs. There's been a pretty wide variance in where this card has sold in the last few months, and that could be impacted by things like centering, and eye appeal.
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