Banjo Bm7 chord (Double C)B minor seventh on the 5-string banjo: 6 7 9 9, and 2 more shapes

Frets, string 4 to string 1: 6 7 9 9 (from the 6th fret)

1. String 4 (C): 6th fret, index finger, F♯
2. String 3 (G): 7th fret, middle finger, D
3. String 2 (C): 9th fret, ring finger, A
4. String 1 (D): 9th fret, little finger, B
5. String 5, the short g: open, G, not in the chord

Sounds: F♯ D A B  ·  Bm7 is B, D, F♯, A (1 · ♭3 · 5 · ♭7)

The 5th string: the short g rubs against the F♯ in this shape, a semitone away: some players let it ring, some skip it.

Double C tuning: gCGCD, the short 5th string first, then strings 4 to 1.