Cards › 1961 Topps World Series Game 2 #307 Mantle Slams 2 Homers

Is the 1961 Topps World Series Game 2 #307 Mantle Slams 2 Homers worth grading?

Live market numbers as of 2026-10-21 — raw vs. graded value, PSA 10 gem rate, and the breakeven math.

Raw value

$52.50

PSA 9 value

$4,975.09

PSA 10 value

$8,841.22

PSA 10 gem rate

Based on the numbers below, this card is potentially worth grading — a PSA 10 nets an estimated $7,373, but the 0% gem rate means the 10 is far from guaranteed. Weigh the PSA 9 outcome below.

The breakeven math

Line item	Amount
Raw purchase	$52.50
Sales tax (8%)	$4.20
Grading fee (priority tier)	$80.00
Shipping	$5.00
Total cost basis	$141.70
Net at PSA 10 (85% payout)	+$7,373.34 (+5203%)
Net at PSA 9 (the downside case)	+$4,087.13

Assumptions: $80 grading, $5 shipping, 8% tax on the raw purchase, and keeping 85% of the sale after marketplace fees. Your numbers will differ — run them below.

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Card pricing data provided by SportsCardsPro, a service of PriceCharting. Gem rates reflect recent PSA population data (4,168 graded submissions). Not investment advice — grading outcomes are probabilistic and markets move. © Summit Sports Cards · About · Pricing