I remember there was a specific year given (sometime in the 1960s), but for the life of me I can neither remember or find it anywhere. I googled it and even looked at the trade at my local library and nothing (for whatever reason I'm guessing in the various reprintings they obscured it in the panels). I remember the sequel in the regular Wolverine book at the time by Larry Hama and Marc Silvestri was partly written to vague it up a bit because TPTB didn't like a solid date on that, but I'm really super curious.
Anyone know?