Bullet

Bullet Records was an US Independent label, founded in March 1946 by Jim Bulleit at 423 Broad Street, Nashville, Tennessee.
The label was active until 1953.

Source: Discogs

White gospel: 100 Series

R&B/Blues: 200/300 Series

Hillbilly: 600/700 series (over 150 singles)

Pop: 1000 Series