I gotta stay loyal to my AR-3a. They're my favorite sounding, looking, feeling (heavy!), so they gotta be my favorite smelling too. I haven't gotten the fifth sense involved yet, but if I ever lick them, I'll let you know.
When I pulled my Jensen H222 coaxial drivers out of the shipping container, I got a strong whiff of cigarette smoke. They had been wrapped in plastic bags so the smell probably built up on the trip. Strangely, after the smell faded for a few days, I found the faint remnant somewhat pleasing. Gives them a sort of Rat Pack vibe, appropriate to the era they were made.