Numbering Machine 7 Digit Convex Backward for Heidelberg GTO and QM Go to amazon.com Related posts Top gto numbering machine for 2022 FeatureModel: CL1200Wheels: 7 Digit Convex BackwardCharacter height: 3/16" GothicCompatible With: Heidelberg GTO52, GTO46 and QM46 (Quickmaster)