12×12 mat —
6.00″ × 10.11″
Unglued selflocking tray with 2 double walls; locking flaps system with fold over ends with nib locks. The paperboard counterpart to FEFCO 0422: the end walls fold back down inside themselves, and a bump on each folded edge tucks behind a tongue slit into the base. The corners are open rather than webbed, closed by the side walls carrying past them. The catalogue draws those corners at the full wall height; here each stops short of its opposite number, which a tall narrow tray outgrows. ECMA catalogue, p.38 ↗