During World War II, the only producer of .50 cals in the United Kingdom was a factory called the Royal Ordnance Factory in Spennymoor. This cartridge was primarily used in aircraft and vehicular mounted machine guns during WWII. More recently it has been developed for sniper rifles because it can range over a mile.
- 13mm round signet ring
- 10K White Gold with 14K Yellow Gold center
- Available in 2 fits: Luxe and Basic
- Available in 2 finishes: Satin and Polish