NOTE: What you see in the first picture is what you get, i.e., there is no center-mounted hardware of any type included.
NOTE: The second picture is a stock picture and has only been included for reference.
This Nardi Classic steering wheel has black leather hand grips, dual horizontal grey stitching, and anodized black spokes, HOWEVER, it is missing the matching black center ring, hub, hardware, and classic Nardi horn button, etc.
This steering wheel was found stored away in the box of a 1993 Moma / Benetton Harlequin Formula 1 steering wheel, and so my guess is that its manufacture precedes the sale and then resale of the Nardi trademark, and the manufacture of the more modern/current, "Nardi," steering wheels.
The steering wheel's diameter is 390mm (15.35 inches).