Slightly off-topic but possibly still relevant for Earl's quest, if only as a hint:
Quattroruote No, 84 (Dec-62) talks on p. 120-121 about 3 new colors for Giuliettas: Arancione Aragosta for the Spider, Marrone Testa di Moro for the Sprint, Verde Oro Antico for the Berlina T.I.
Given the printing quality, this last color looks remarkably similar to the one of the car in question. However, I never saw this color mentioned anywhere else and I don't have a paint code for it.
[SIZE="1"]'63 2600 Touring Spider (AR 191437, the car that started the 2000/2600 International Register, reassembly in progress)
ex-'65 2600 SZ (AR 856043, the car in my avatar, sold as resto project to Austria)
Maintainer of a private 2600 SZ register (not the one in the Netherlands).[/SIZE]