Charles Wells might not have had the best reputation but he was good at roulette. One evening in 1891, Charles went to the world-famous Monte Carlo Casino Resort and started playing roulette enjoying a winning streak of a lifetime (winning 23 out of 30 consecutive spins).
It's a 9 chip bet covering 16 numbers either side of the zero, so a 17 number bet in total. In the example above, the blue chips are 5s and the pruple chips are 10s. The proper name for this bet is Grand Voisins du Zro: it's 17 numbers between (and including) 22 and 25 on a European Roulette Wheel.