2021 Panini Donruss Optic Signature Series Younghoe Koo #SS-YK
2021
See all Younghoe Koo cards & values$11.11est. value (ungraded)
Prices updated 2026-10-25
Based on recorded sold prices how we price cards
Younghoe Koo price history
PSA 10 market value, one reading a day. One-day spikes that reverse the next day are left out.
Price by month
Average price of the 2021 Panini Donruss Optic Signature Series Younghoe Koo #SS-YK each month, from 1 recorded price reading. Prices are re-checked regularly; a month's average counts each day from that month's first reading at the price that held that day.
| Month | Source | Average | Range |
|---|---|---|---|
| Oct 2026 | Market value | $11.11 | — |
Younghoe Koo prices by grade
| Grade | Value | eBay |
|---|---|---|
| Ungraded | $11.11 | Buy on eBay ↗ |
| PSA 8 | $13.58 | Buy on eBay ↗ |
| PSA 9 | $23.00 | Buy on eBay ↗ |
| Grade 9.5 | $39.61 | Buy on eBay ↗ |
| PSA 10 | $47.43 | Buy on eBay ↗ |
| BGS 10 | $62.00 | Buy on eBay ↗ |
| CGC 10 | $19.00 | Buy on eBay ↗ |
| SGC 10 | $16.00 | Buy on eBay ↗ |
Live on eBay
Affiliate — we may earn a commission2021 Panini Donruss Optic Signature Series Younghoe Koo #SS-YK value & prices
The 2021 Panini Donruss Optic Signature Series Younghoe Koo #SS-YK is a Football card released in 2021. Ungraded copies carry a market value of about $11.11.
An ungraded copy is worth around $11.11, a PSA 9 around $23.00, a PSA 10 (Gem Mint) around $47.43 and a pristine BGS 10 around $62.00. That's roughly a 4.3× premium for a gem-mint copy over raw — one of the clearest signals that condition-sensitive buyers dominate this card's market.
Is it worth grading?
The spread between raw ($11.11) and top-graded ($47.43) copies is fairly tight, so grading this card only makes financial sense for truly flawless copies — or for collectors who simply prefer slabbed cards for protection and display.
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