Brunswick Score King 50 Bowling Pin

Here is the venerable Brunswick Score King 50. This is more commonly found nowadays than the Score King without the "50" designation. I'm researching this and if anyone has any idea as to the significance of this, I'd surely welcome your help. It has a curious medallion design in that the "50" overlays the Brunswick brand and the Score King designation. On many of these pins, you can also see some feathering at the tips of the crown neckband. this is a result of the paint mask slipping or lifting while the neckband is being spray painted. It's a bit more complicated and prone to error than the simpler ring neckbands such as found on Qubica or Vultex pins, for example, which can be rotary pad or brush painted on a lathe.