Seaking

Seaking (21/109), the Rare from Ruby & Sapphire, has an estimated ungraded market price of about $1. Note: 14 other cards named Seaking exist across the sets Riffle tracks, at very different values; check the collector number.

This page covers Seaking (21/109), the Rare (about $0.80–$1) from Ruby & Sapphire.

The other versions: #59/147 from Aquapolis (Uncommon, about $15–$20); #37/64 from Neo Revelation (Uncommon, about $2–$3); #43/147 from Supreme Victors (Rare, about $1–$2); #46/64 from Jungle (Uncommon, about $1–$2); #24/107 from Deoxys (Rare, about $1–$2); #60/130 from Base Set 2 (Uncommon, about about $1); #62/130 from Diamond & Pearl (Uncommon, about under $1); #49/214 from Unbroken Bonds (Rare, about under $1); #28/162 from BREAKthrough (Uncommon, about under $1); #021/131 from Prismatic Evolutions (Uncommon, about under $1); #119/165 from 151 (Uncommon, about under $1); #045/167 from Twilight Masquerade (Common, about under $1); #014/84 from Pitch Black (Uncommon, about under $1); #47/202 from Sword & Shield (Uncommon, about under $1).

The collector number printed at the bottom of the card is the reliable way to tell them apart.

Ahead after fees: with a 9% PSA 10 gem rate and current graded prices, grading a near-mint Seaking (21/109) is estimated to net about $16 more than selling it raw (est.).

Assumes ~$25/card bulk-rate grading (standard service costs more); ignores turnaround time, sub-9 grades, and shipping. A screen, not a promise.

Seaking (21/109) is a Rare. PSA has graded 67 copies to date, so graded supply is measurable and growing.

Of the 67 copies PSA has graded, 9% earned a PSA 10. That's a low gem rate, so flawless copies are genuinely hard to come by. Grade-by-grade population and pop-over-time appear with Riffle premium.