Salt and pepper carpet to solid black

[Nelson]

Anybody know when the salt and pepper carpet was dropped in favor of the solid black?

[1963r2]

Probably when they simplified the interior on the 64 models.

[mfg]

16 hours ago, Nelson said:

Anybody know when the salt and pepper carpet was dropped in favor of the solid black?

R4892 was first Avanti built with all the  original ‘64  factory updates.  (minor additional changes came even later)

That serial number may be your answer.