Number 0 (zero) as it is a plain box and you can request any text / number you want on the box in the appropriate font for the era.
An empty reproduction box for the 1993 - 1997 series Matchbox Superfast models. USA Market issues. We reference this as the 'M' style.
This listing is for a standard or generic M style box with custom text on the end flaps to suit your model.
The images feature examples of this box (#41 Jaguar). Really suits your Code 3 Custom models.