J.M. DeMatteis writes a fan letter to MASTER OF KUNG-FU in 1977. The same month that the ORCA ad was on the back of every Marvel comic printed. This will exactly place the date and time for some of you.
EDIT - I don’t mind saying that I’m pretty happy that this post fills a hole in Mr. DeMatteis’ collection of memorabilia, as he didn’t hold onto a copy of the book. Also led to a nice chat via twitter about the simple beauty of the Bronze Age as a whole, where the threat of looming deadlines forced creators to squeeze out sparks on a regular basis, fires starting from that friction.