Yep, definitaly gray.
The spring that holds the jack in the trunk is supposed to be zinc plated but my origonal one doesn't look like it. It is more of a natural gray metal color. I suppose different chemicals were used in the 70's so zinc plating today doesn't look like zinc plating from back then . Mine was in good shape so I didn't replate it. I'm just going to clean it up a little with some steel wool.