The slot for the chain cutter blade is more longer on some models, near the top of the slot.

The body molding until 1979 have some variations in the area of the bat nose, short slot, half-short slot or long slot.

Most commun is the short slot.

This occurred throughout 1970 to 1979, this was simply a moulding error which could have occurred any number of times on the 1970-1979 Batmobile.

This is the most commun short slot :

This is the longer slot (1970 - Reb Bat Hub) :

This is the longer slot (1972 - Reb Bat Hub) :

This is the half-short slot (1974 - Aqua) :

This is the half-short slot (1977 - National) :