Both '63 and '64 Avantis came with two keys, one for the doors & ignition switch, the other for the glove compartment and console.
By this point in time many Studebaker Avantis have had either their ignition switch (including the cylinder) or door locks changed, so will have different keys for the doors than for the ignition. But, when new they used the same key for the doors & ignition.
BTW, with rare exception, 1963 Avantis used a different key blank than '64 Avantis. Studebaker switched at the start of the '64 model year. The two key blanks look entirely different.
--Dwight