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$1 FRN Fancy SN (Bookend Trinary Five 6s-in-a-Row) J06666640B VERY COOL, VF + BONUS! FS9 📌 Description: United States $1 Federal Reserve Note Series (2021) District 10 – Kansas City (J) Fancy Serial Number: J06666640B Grade: VF A striking Trinary Bookend fancy serial number featuring a powerful run of five 6s in a row, framed by matching zeros — a bold and desirable visual pattern. ⭐ Fancy Serial Features (AI-Verified Rarity) ⭐ • Five 6s in a row (06666640)  — Appears in only 0.037% of all 8-digit serial numbers  — ≈ 370 per million numbers • 5-of-a-kind + 1 pair  — Found in just 0.13% of numbers • All digits are even  — Only 0.39% of serials have this property • Trinary with only 3 unique digits  — Seen in 0.71% of numbers Coolness Level: Very high — a visually dramatic and statistically rare structure. AI Price Estimate (VF Condition) $39 – $89 5-in-a-row patterns are premium collectible fancy serials with steady demand. ⭐ BONUS FOR BUYERS ⭐ 10% OFF both of my signed books: • MWR – Mehilba World Replacement • Guide to U.S. MPCs (advanced preview available) Plus: FREE professional appraisal of any banknote or coin collection. ​ 🚚 Combined shipping available.