C# 6/9 — Resonator Guitar
C# 6/9 has no straight-bar or slant shape in open G (GBDGBD).
C# 6/9 stacks C# – D# – F – G# – A#, but no bar position on the Resonator Guitar's open G (GBDGBD) strings sounds that set: at every fret, and on every short slant a steel can hold, a tone the chord needs is missing or too few strings land on it.
A guitarist would reach for a fretted grip here. A squareneck has no fretting hand, so this page charts nothing rather than a shape no steel can play — the qualities this tuning does spell are on the C# chord list, marked shape by shape.