Hmmmm- Not a 3A graflex or Compact Graflex but postcard Speed? COOL
Is it a spring back?
The Compact took film/plate holders or a roll film back that used 5 1/2 in wide [or so] rolled vertically.
My 3A graflex has a B&L VIIa double 11 3/8 +/- [ 122 roll film ]