Miniature Speed Graphic with Kalart RF and spring back. 2.25" x 3.25". Sean, since you live in a metric land, " means inch. The likely roll holder is an insertion type. The easiest to find is the Adapt-A-Roll 620, which slips in like a sheet film holder. They will feed film on a 120 spool, must take up on a 620 spool. Beware, there are three sizes to fit, respectively, 2x3, 3x4 and 4x5 cameras. You want one to fit a 2x3 camera.
Brad, "baby Speed Graphic" is widely used but is ambiguous. There's more than one model. Formal names are Miniature Speed Graphic, 2x3 Pacemaker Speed Graphic, 2x3 Pacemaker Crown Graphic and Century Graphic.