Envelope Converting Service, Inc. / Adjustable high die / Side seam blank
Loads the published one-up geometry for that die.
Type decimals or fractions: 4 1/8, 4-1/8, 4.125
Back panel folds up and glues to both side flaps.
Gripper 1/4" on all four sides.
Printed one-up sheets only. ECS's yield table counts envelopes cut straight from unprinted stock, which runs higher.