Not serial numbered, but in a market flooded with serial-numbered parallels, this stands out as a unique item with a print run worthy of a serial number - just without the stamp. Although not nearly as desirable, there are roughly 1.5× fewer Stadium Club Black & White (98) than Topps Chrome Orange Refractors (Refractor, Wave, RayWave, Lava, Geometric, Sapphire - 6×25 = 150).
Short Print (1 in 90 hobby packs; 2.8 per 16 box hobby case). Print run is 98. Odds of this specific card is 1 in 70 cases) (hobby only)
Fun Math Section
Gold Rainbow Foilboard (1/1): 1 in 8,797 packs (hobby only)
Black & White: 1 in 90 packs
8,797 ÷ 89.76 = 98