Copies are matched across platforms by set, card number, and language (registry v1 — exact normalized matching). FMV figures combine licensed market data calibrated against observed sales, provided as-is.
3 copies for sale across Courtyard · from $18.00
PSA 9 MINT
$21.50 · 2 listed
PSA 8 NM-MT
$18.00 · 1 listed
2025 Topps 1980-81 Topps Basketball #80BK-53 Kon Knueppel (PSA 8 NM-MT)
$18.00USDC
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2025 Topps 1980-81 Topps Basketball #80BK-53 Kon Knueppel (PSA 9 MINT)
$21.50USDC
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2025 Topps 1980-81 Topps Basketball #80BK-53 Kon Knueppel (PSA 9 MINT)
$35.00USDC
CourtyardPolygon
2025 Topps 1980-81 Topps Basketball #80BK-53 Kon Knueppel (PSA 9 MINT)
$22.00USDC
CourtyardPolygon
2025 Topps 1980-81 Topps Basketball #80BK-53 Kon Knueppel (PSA 9 MINT)
$24.96USDC
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