Looks like Dolphin Grey (356C/SC paint code 6410)
Will be what I do with my car when I can afford to rustore it.
Honestly, if I could afford a second 356... I'd do the one I have as perfect factory, do the second as a clone but change to tinted windows, black nitride "chrome", and a hot VW engine.
I've seen DG on black (my car), DG on Navy (Pedro's ... think he is/was a member here) and DG on red. The black looks the best of the 3, but navy and red aren't "bad".